Aviary 2.0

Aviary 2.0

NOTE: This is not an endorsement of any particular style of building an aviary. I present this as a design I found compelling enough to use and the things I learned over time.

Two years ago, I built an aviary in the backyard. Just last month, with the help of a carpenter this time, I finished a significant renovation and expansion. I incorporated a large number of changes based on my first design. For those not interested in my detailed description of the new aviary, here is a photo gallery.

The original aviary was approximately 128 square feet, while the new one totals around 192 square feet. But because of the layout, there is a much longer flight path the birds can take so it seems much more enjoyable to them.

Purpose

The main purpose for this aviary is that birds come into rescues and shelters aren’t suited for living indoors. For example, they may have lived their entire lives outdoors in a large aviary. Also, some species of birds tend to have high mortality rates when kept in cages inside homes and do much better in an aviary.

I wanted to provide a nice space for these birds that otherwise have trouble finding a good home.

Species

The original aviary was intended to be a cockatiel aviary but grew to accommodate a wide variety of small to medium-sized species. This was the max population:

  • 5 cockatiels
  • 7 grass parrots (3 species of neophemas)
  • 3 bourke’s parrots
  • 2 red-rumped parrots
  • 1 rosella

In the future, the following are being considered:

  • 1 canary-winged parakeet (already received as I was writing this)
  • 2 cockatiels
  • 7 budgies
  • 1 lory

Original aviary

I did a lot of research for my original aviary, choosing to model it after an Australian dirt floor aviary, using thin wood and wire for maximum visibility and sunlight. However, there’s surprisingly little advice out there on some of the finer points of building an aviary, outside of the structure itself.

Having very little experience building anything, I’m still quite proud of the first version of the aviary.

Original aviary: Main entrance. Bird house on the left. One section goes off to the right behind the shrubs.

Some info on it:

  • Structure is 2×2 redwood lumber (note that some pressure treated or stained wood may not be safe for birds to eat)
  • Wire is 18 gauge stainless steel, 1/2″ x 1/2″ (hardware cloth may not be safe for birds that can eat the zinc chunks)
  • Foundation is a perimeter of gravel with a row of bricks stacked on top. Gravel was designed to be deep enough to prevent intrusion by rats. So far, so good.

What I learned

In the first two years, the aviary proved to be overall better than I expected, but I uncovered many small and serious flaws in the original design and construction.

Airlock

I’ll start with the biggest mistake by far, which was the “airlock” design. An airlock is often a double-door system so that you can enter the airlock, check for birds, then enter the aviary without risking escape. Because of the very limited size of the original aviary, I decided to use this aluminum chain curtain just inside the door that I thought would work fine.

To give myself some credit, I showed this to a handful of bird people and they thought that it was a good design.

Original aviary: Seems like aluminum chains near the door should have worked.

With this design, I’d open the door and stand inside the curtain, then shut the door. Once I verified the airlock was clear, I’d part the curtain. When birds were flying around, they always avoided the airlock so it seemed like it was going to work.

Then one day I opened the door and noticed too late that there was a bird on the ground of the airlock area, very close to the door. Out the door he went, never to be seen again. Not sure I will ever get over it.

I eventually figured out the birds weren’t flying through the curtain. They were walking between the chains on the ground. Once they were through it, they would climb around and get trapped in the airlock area.

Original aviary: On the left, trappped inside the airlock. Not good!

On top of the loss of a bird, this was a constant headache as birds would sometimes be trapped in this area when I needed to get into the aviary. I would keep a long thin pole that I would use to part the curtain and try to coax birds back into the aviary.

The redesign’s #1 purpose was to add a proper double-door system. Side benefits included increasing the size of the overall aviary and addressing deficiencies in the original design.

New aviary: Even the cat likes the new airlock in the front on the right.

Roof sagging

In one section of the original structure, I had 8 foot long 2x2s that were supporting the roof. I knew that I was pushing it with 2x2s but I was willing to accept some sag. I wanted as much light to be able to get into the aviary as possible so I thought it was a good compromise.

Two years later, in the middle of the aviary, the roof was sagging 2-3 inches in one spot, getting to the point where it was impacting my head room. I also lacked confidence that the aviary was structurally sound even though a carpenter I hired felt that it was been fine.

This was fixed by adding 2x4s for roof support and also in the construction of the new section. I continued to use 2x2s for all the walls as they result in a more lightweight structure.

New aviary: All the wood you see behind the roof section is 2x4s that were used to reinforce the original roof.

Cover from rain

I had thought the birds would use the shelter I built during bad weather. However, on rainy nights, I would go out and see soaked birds that didn’t know where to go. So I started using this umbrella fabric to selectively cover areas. I originally did not want to have a roof because the aviary is in a shady spot and I wanted as much sun to filter through as possible.

The umbrella fabric was a reasonable compromise but water would collect on top due to the roof being completely flat. In the redesign, I covered certain areas with white PVC roofing material and angled the roof in the new sections. The roof lets some light in without causing the aviary to overheat. I don’t love it, but it appears to be working well.

The end result is an aviary that is at least half covered, and 2 of the 3 perching areas are covered. Birds have the choice whether to be in the rain and/or the sun.

New aviary: About half the aviary has a covered roof. The sides are all open to the elements so there is plenty of choice in how much sun they get.

Shelter

About 18 months after the aviary was built, I did a large rescue that had multiple species and I also adopted a Rosella. The aviary that started as just cockatiels now had 7 species. The shelter was too small and had only one large room. I noticed that some species were monopolizing space in the shelter and not letting others in.

Although no breeding took place in the shelter, I also learned that my shelter design was too much like a nest box and may encourage egg laying.

Original aviary. Had an opening door, but intended to be kept close with access only via the birdhouse opening on the right.

I redesigned it to be open from the front and partially on the bottom to discourage cavity nesting. I also added some flat panel radiant heaters to make up for the fact that the front of the structure was now open. I made the shelter twice the size and set up 5 compartments so compatible species can hang out together and not get harassed as much.

This has been very, very successful so far, with different species hanging out and eating in different sized compartments without getting chased off.

New aviary: Shelter is plywood stained with Osmo wood wax, a stain that the EU deems safe for edible children’s toys.
New aviary: Small birds in small compartment. Note flat panel heaters on back wall. I’ve seen 4 of 5 compartments actively in use at one time!

Wire gauges

I’ll take a slight detour here and talk about choice of wire gauges. I used 18 gauge stainless steel wire, 1/2″ x 1/2″ mesh. This is perfectly fine for keeping out predators, is easier to work with than 16 gauge, lighter, and about 40% cheaper. It’s also thinner, so it allows better visibility into the aviary from the outside. The downside is that it doesn’t have enough structure to support attaching things to the wire, like perches.

For reasons I’ll describe later, I don’t regret going with the thinner gauge, but for a long time it limited my perching choices to things that could attach to the wood frame of the aviary. If you’re designing an aviary, I’d still recommend the thinner gauge but keep in mind the tradeoffs.

Actual size. Not really.

Perching space

The presence of so many species and birds means you need enough space so they can co-exist without needing to fight to get access to food, water, and sleeping space. Because of the thin gauge wire mentioned above, I had to construct perching areas off the wood frame rather than the wire in the original aviary.

This led to less than ideal perching options, with not enough space overall. Perches were too close and at right angles to each other. There was no easy way to walk away from a conflict. Also, the design was such that cleaning was a bear.

Due to the roof issues and rain, more birds would try to huddle into covered areas during rain, leading to more lack of harmony.

Original aviary: Perching was basically 1x6s, 2x2s, whatever perches I could figure out how to attach, and then rope swings and boings hung from the roof.
Original aviary: On a sunny, dry day, I’d often see many species together like in this photo. I think just knowing you have a space to go in case of conflict helps a lot.

Someone to help

The first iteration of the aviary I did entirely myself. For the most part, this worked fine, but you really need a second person at critical moments in construction. For the renovation, I worked with carpenter, and that worked out just great! But not everyone can afford to pay someone to help. Just getting a neighbor kid to hold some boards at certain points can be a lifesaver though.

A side note about levels that I learned when I built the first iteration.

It goes without saying that you should judiciously use levels when building any structure. Line levels, regular levels, possibly even plumb lines. I learned that you want to be VERY precise with a level and not be happy with “almost” perfectly straight. Eventually, this ends up biting you.

It’s hard to juggle all these leveling devices and structural lumber, so be sure to have someone to help at these moments as I mentioned in the previous section.

Consider buying a door

Unless you’re a really good carpenter, I highly suggest framing a door and then buying an off-the-shelf screen door. If the door to your aviary is the first door you’ve ever built, you can either consider it a potentially maddening learning experience or you can just save yourself the trouble. Doors are hard. An honest carpenter will tell you that.

Original aviary: A picture of a door often makes the door look a lot better than it is.

One really important point is that you really don’t want to be messing with the door of an aviary if you’ve made one and it doesn’t work right. You don’t want to have to net a bunch of birds just so you can take down and fix a door or keep it propped open while you adjust it.

Herbs and plants

One of my amazingly successful ideas in the original aviary was to plant herbs and other small plants on the floor. In my case, I happen to have a lot of ground-feeding Australian birds but I think it could work with other birds as well.

When I had just 5 cockatiels, I could buy a few new plants each month and keep up with the destruction. But then I got these red-rumped parrots and grass parrots and it’s amazing what they can demolish in a day. It become impossible and just too expensive to keep up with the destruction. Also, it’s kind of depressing to look at dead stumps.

Original aviary: We’re so little, I promise we won’t eat much!
Original aviary: The turquoise and grey pair are especially destructive.

I hatched a new idea for the new aviary and even though it’s early, it seems to be working. I have some individual planters and then a space in the aviary where I can set them down and they are at ground level. Here’s a picture of just one planter at ground level.

New aviary: This has some rosemary in it. This holds up to 5 planters.

Outside the aviary you can see other planters in various stages of growth. What I do is put in fresh planters and then rescue them before they get destroyed completely. Then I bring them out and let them regenerate. If I don’t catch it in time, I just plant some new seeds in the planters.

It doesn’t have to be this elaborate, but there is something to be said for destroying a real plant versus being given some on a plate or in a clothes pin. They seem to enjoy the real experience!

Perching stations

I mentioned in the sections on wire gauges and perching space that I struggled for a long time with perching solutions. All I knew was that I wanted the following things, but didn’t know exactly how to get them.

  • Stable perches that don’t need to be attached to wire
  • Ability to attach multiple perches at different heights and angles
  • Ability to accomodate natural wood perches of varying dimensions and branching patterns
  • Ideally perches that can be swapped out with new ones where bark/lichen can be munched on

I came up with something I’m quite proud of that is working really well.

I started with 2×2 lumber, attached to the roof structure. At the bottom, I pounded in 4 foot metal stakes that have screw holes to be attached to the 2×2 posts. Then I have a solid pole to attach perches.

New aviary: Perch station attached to wood frame at top.
New aviary: Perch station attached to a metal stake at the bottom.

Now I’ve got a solid vertical pole, spaced away from all the walls, where I can attach perches, toys, mineral blocks, and mirrors. Without going into excruciating detail, here’s what I needed as far as hardware:

The hanger bolts allow you to screw into wood branches and then make a perch that will take standard machine nuts.

This is what a hangar bolt looks like. If you’ve bought perches, they likely used hangar bolts to provide something to attach wing nuts to.

Since I used 2x2s for poles, I wanted to be able to attach perches at angles, so the spade bit allows me to drill a flat spot at an angle for the perch to attach to.

New aviary: Here you can see perches at various angles, a cuttlebone strapped with wire, and a toy hung off the end of a wing nut.
New aviary: Repeating the same photo just to show off the mirror and other doodads..

Now I can change out perches whenever I want, add toys, and other doodads. Much more stable than attaching to the wire. The birds love destroying the bark, lichen, and small bits of branches. It’s basically like another toy.

Water and power

I didn’t run water and power to the original aviary as it was an added expense and just didn’t seem necessary. However, a lot changed in 2 years that I didn’t anticipate:

  • I redesigned the shelter and needed to plug in heaters
  • I wanted to run a fan on hot days and to keep mosquitoes in check during wet periods
  • I got tired of a hose and an extension cord cutting across the yard and poking through the outside wire of the aviary.
New aviary: Didn’t think I’d need a fan or power for flat panel heaters when I first built the aviary.

If you’re planning an aviary, you might want to consider having these options available as needs are inevitably going to arise. It’s more of a hassle and probably more expensive to add them later.

Viewing

I didn’t design the original aviary for viewing and spending time with the birds. It seems like such an obvious oversight! This time around, I set things up so I have a chair in the middle where I can see all 3 perching stations and also peer inside the new shelter.

If you have a comfortable place out of direct sun where you can sit amongst your birds, you’re going to spend far more time with them, which is a win-win situation. Get a nice comfortable mesh chair that is easy to hose off.

Dirt vs gravel

My first design was for a dirt floor aviary with areas of gravel where I needed to walk and didn’t need to plant anything.

Original aviary: Dirt with sand on top on the left and then gravel on top of soil in the bottom right.

After a few years, I found some downsides to the dirt floor concept.

First, the birds would get kind of filthy digging around and there were many times I thought there was something wrong with them but it turned out they just had mud on them. It was muddy because of the abundance of plants I was growing for them to eat that needed to be watered.

Second, in high traffic areas that would get caked in poop, I found it very difficult to disperse the poop with a hose without ending up spraying mud everywhere, including on myself. Areas where there was a layer of gravel on top of soil made it so that I could hose off the poop with less trouble.

I noticed that areas of the aviary with shallow gravel would still end up getting dug up by the birds. However, because the gravel allowed for better drainage, the soil would end up being drier and less likely to get them dirty. So they could still dig without getting muddy.

In the new aviary, I decided to put about 2-3 inches of gravel on top of the soil in most places. This allows the ground birds to be ground birds, allows them to dig in soil that’s generally well drained, and also allows me to hose off the poop so it doesn’t collect too much on the ground.

In the less trafficked areas, I’ll leave a thinner layer of gravel to allow for more digging. In these areas, I don’t need to hose any poop, so I don’t end up spraying soil everywhere.

New aviary: Now it’s a few inches of gravel on top of soil.

I feel like there’s a better answer but for now, this seems like a good compromise that allows the birds to be birds and me to be me.

Conclusion

When I designed my original aviary, I did tons of research and I tried to design it such that it could be extended to cover potential future needs. It turns out that this is extremely difficult to do! With my re-design, I feel that it’s much more modular and the stronger structure means I have an ability to leverage the roof for future changes.

Consider this article my contribution to backyard aviary research as there is really is not very much out there for this style of aviary. There are lots of plans you can use, but they typically cover some cookie-cutter structures and don’t go into what goes on inside the aviary. This is the really important stuff that makes it a great place for humans and birds.

The majority of aviaries are cement floor, typically with a drain, and then heavy wire and metal piping. For many reasons, this doesn’t appeal to me so I went down a different path. I’m happy with the path I’m on but it’s definitely been a learning experience that has not been without its struggles.

Perhaps in a future article I will research aviary designs if I can find any compelling research into the topic.