Preserving a bird’s nest is straightforward once you’ve confirmed it’s legal to keep, killed off any hidden parasites, and stored it properly. The entire process takes about a week, with most of that time spent in the freezer. Here’s how to do it right.
Check Whether You Can Legally Keep It
In the United States, most bird nests are protected under the Migratory Bird Treaty Act. This federal law makes it illegal to collect, possess, or transfer possession of nests belonging to migratory bird species, even if the nest is empty and sitting on the ground. You cannot legally pick up a robin’s nest, a wren’s nest, or a hummingbird’s nest without a permit from the U.S. Fish and Wildlife Service. Eagle nests (bald and golden) carry even stricter protections under a separate law and require a permit to disturb at any time, whether occupied or not.
There are exceptions. House sparrows and European starlings are not protected by the MBTA because they’re non-native, invasive species. Nests from pigeons (rock doves), peafowl, and other non-native domesticated or introduced species also fall outside the law’s reach. If you find a nest and can confidently identify it as belonging to one of these species, you’re free to collect it.
If you’re unsure what species built the nest, the safest approach is to leave it where it is. Penalties under the MBTA can include fines per violation. For the rest of this guide, we’ll assume you’re working with a nest you can legally possess.
Wear Gloves and Work Outside
Bird nests can harbor bacteria, fungal spores, and parasites that pose real health risks. Mites are the most common concern. Many species of bird mites will bite humans when their original host is gone, causing itchy welts. Nests can also carry organisms that cause respiratory infections, and dried droppings may contain coccidia or other intestinal parasites.
Handle any nest with disposable gloves, and do your initial inspection outdoors. If the nest has visible mold, heavy droppings, or a foul smell, it may not be worth preserving. Gently shake or tap the nest over a white surface to check for live mites or beetles. Even if you don’t see anything, assume the nest carries hitchhikers and proceed with sanitization.
Remove Loose Debris First
Before freezing, do a light cleaning. Use tweezers to pull out any feathers, droppings, eggshell fragments, or bits of trash woven into the structure. A soft-bristled paintbrush or old toothbrush works well for sweeping away dirt and dust from the outer surface. Be gentle. Many nests are more fragile than they look, especially those made primarily of grass, moss, or spider silk. Work slowly and let the shape of the nest guide you rather than forcing material out.
Freeze the Nest to Kill Parasites
Freezing is the standard method museums use to eliminate mites, larvae, and beetle eggs from natural specimens. Place the nest in a sealed plastic bag (a zip-top freezer bag works fine) and put it in your home freezer. A chest freezer set to around 14°F (-10°C) is ideal, but a standard kitchen freezer at 0°F (-18°C) works just as well.
Leave the nest frozen for a minimum of 72 hours. A full week is better and is the typical duration used by natural history collections. For extra insurance, you can use a freeze-thaw-freeze cycle: freeze for three days, bring the nest back to room temperature for 24 hours to encourage any dormant eggs to become active, then freeze again for another three days. Museum conservators at Louisiana State University have noted no damage to specimens from this process.
When you remove the nest from the freezer, keep it in the sealed bag until it reaches room temperature. This prevents condensation from forming directly on the nest material, which could encourage mold.
Dry It Thoroughly
After freezing, the nest needs to dry completely before long-term storage or display. Place it in a warm, dry spot with good airflow for two to three days. A sunny windowsill works, but avoid leaving it in direct sunlight for extended periods, as UV light will fade natural colors over time. If you live in a humid climate, placing the nest near a fan or in a room with a dehumidifier speeds things up.
The nest should feel completely dry to the touch, with no damp or cool spots, before you move on. Any residual moisture trapped in thicker materials like mud or moss will eventually cause mold.
Optional: Seal With a Light Fixative
If the nest is particularly fragile or you plan to handle it often, a light coating of clear acrylic spray (matte finish) can hold loose fibers in place and add some structural integrity. Hold the can about 12 inches away and apply one or two thin coats, letting each dry fully. This step is purely optional. It slightly changes the texture and sheen of the nest, so skip it if you prefer a completely natural look. For sturdier nests made of twigs and sticks, no sealant is needed.
Store or Display It Properly
The biggest long-term threats to a preserved nest are moisture, light, dust, and insects. Museums store nest collections in sealed cabinets that block UV light, buffer humidity changes, and keep pests out. You can replicate this at home with a few simple steps.
For display, a glass cloche (bell jar) or a shadow box with a glass front protects the nest from dust and curious fingers while letting you enjoy it. Place it away from windows where direct sunlight would hit it daily. UV exposure breaks down organic materials over time, fading colors and making plant fibers brittle.
For storage, place the nest in a sturdy box lined with acid-free tissue paper or clean cotton fabric. A sealed plastic container also works, as long as the nest is bone-dry before you close the lid. Keep it in a room with stable temperature and moderate humidity. Avoid attics, basements, and garages where temperature swings and dampness are common. Too much humidity encourages mold growth, while extremely dry conditions can make the nest crack and crumble.
Check stored nests once or twice a year for signs of new pest activity, like tiny holes, fine dust (frass from beetles), or webbing. If you spot anything, run the nest through another freeze cycle to stop the problem before it spreads.
Nests That Need Special Care
Not all nests are built the same way, and some require a gentler touch. Mud-based nests, like those built by barn swallows, are heavy and brittle once dry. Support them from below during handling and avoid any pressure on thin walls. Nests woven with spider silk or lined with animal fur tend to compress easily, so store them where nothing will press down on top of them.
Nests incorporating green moss or lichen will lose their color over time regardless of what you do. This is normal. The greens will shift to brown or tan as the plant material dries, and no preservation method will prevent it entirely. Keeping the nest out of direct light slows the fading but won’t stop it.