Pigeons vs. Doves vs. Sparrows Under Solar Panels
Pigeons are the largest and messiest of the three, with a loud, low coo, chunky gray bodies, and sloppy stick nests that create the most droppings and debris. Mourning doves and white-winged doves are slimmer, quieter, and build a thinner, more delicate nest, while house sparrows are noticeably smaller, chattier, and tend to stuff nests into tight gaps rather than build a platform. The distinction matters in Arizona specifically because doves are protected under federal law in a way pigeons are not, which changes what you can legally do if there's an active nest with eggs.
Tucson has all three living on residential roofs, often within a few hundred feet of each other, so it's a fair mix-up. Here's how to tell them apart before you decide what to do next.
Size and shape
Pigeons (technically rock pigeons) are the bulkiest bird you'll find under a panel, roughly the size of a small football, with a stocky body, short neck, and a distinctive head-bob when they walk. Mourning doves are noticeably slimmer and more streamlined, about two-thirds the size of a pigeon, with a small head and a long, pointed tail that tapers to a point. White-winged doves sit in between, a bit stockier than a mourning dove, with a squared-off tail and a bold white wing stripe visible in flight. House sparrows are the outlier by a wide margin, barely bigger than your fist, with a short tail and a stout little beak built for cracking seed.
Sound
This is often the fastest way to identify what's under your panels without ever climbing a ladder. A pigeon's call is a low, rolling coo-COO-coo, repetitive and a little mournful, usually loudest right at dawn. A mourning dove's call is softer and more drawn out, a slow ooh-OOO-oo-oo-oo that's easy to mistake for an owl if you've never paired it with the bird. White-winged doves have a rhythmic, almost sing-song call that longtime Tucsonans often describe as sounding like "who cooks for you." House sparrows don't coo at all. They chirp and chatter in short, busy bursts, closer to a constant background noise than a distinct call.
Droppings
Pigeon droppings are the most visually obvious of the three: larger, chalky white-and-gray splatters that build up fast in a concentrated spot and can crust into a thick, flaking layer over weeks. Dove droppings are smaller and more scattered, since doves produce less volume and don't roost in the same tight cluster pigeons do. Sparrow droppings are smaller still, more like tiny dark specks than splatters, and rarely accumulate into the kind of buildup that stains concrete or stucco the way pigeon droppings do.
Nest style
This is the clearest structural tell if you can get a look at the actual nest. Pigeons build loose, bulky platforms out of twigs, dry palm fronds, and whatever debris is nearby, often reused and added to over multiple broods until it's a substantial pile. Mourning doves and white-winged doves build a much thinner, flimsier platform of just a few twigs, sometimes so sparse it looks unfinished, and it rarely gets added to across seasons the way a pigeon nest does. House sparrows skip the open platform entirely and cram loose grass, feathers, and trash into whatever tight cavity they can find, which under a solar array usually means jammed hard against a mounting rail or corner bracket rather than sitting out in the open gap.
Why the ID actually matters
Pigeons (rock pigeons) are a non-native species in North America and aren't covered by the federal Migratory Bird Treaty Act, so removing an inactive pigeon nest generally isn't the legal tangle people assume it is. Mourning doves and white-winged doves are native migratory birds and are protected under that same act, which as general information (not legal advice) typically means it's illegal to disturb an active nest containing eggs or chicks until the birds have finished the cycle and moved on. That's the practical difference: the same gap under your panels can be a same-week fix or a months-long wait depending entirely on which bird got there first and whether eggs are already present.
If you're not sure what you're looking at, or you can see eggs and don't want to guess wrong, the safest move is to have a wildlife or pigeon-proofing professional confirm it before anyone touches the nest. Guessing wrong on a dove nest isn't just a compliance headache, it's the kind of thing that turns a two-day job into a two-month one.
What to do once you know which bird it is
If it's pigeons, you're generally clear to move straight to removal and sealing the gap for good. If it's doves and the nest is inactive (no eggs, no chicks, birds not actively using it), the same applies. If there are eggs in a dove nest, the responsible move is to wait, then seal the space afterward so it doesn't happen again next season. Either way, the long-term fix is the same: close off the shaded, sheltered gap under the array so no bird, protected or not, treats it as a place to move in.
For the early warning signs before you get to this point, see signs of pigeons under solar panels. To understand why that gap is so attractive to birds in the first place, read why pigeons nest under solar panels. Both link back to the full pigeons and solar panels guide.
FAQ
Are doves actually protected by law in Arizona? Mourning doves and white-winged doves are native migratory birds covered by the federal Migratory Bird Treaty Act. As general information, not legal advice, that generally means it's illegal to disturb an active nest with eggs or chicks. If there's any doubt about what's under your panels, confirm with a wildlife professional before doing anything.
Are pigeons protected the same way? No. Rock pigeons are a non-native species and aren't covered by the Migratory Bird Treaty Act, so an inactive pigeon nest generally doesn't carry the same legal restrictions a dove nest does.
What if I can't tell which bird it is from the ground? Sound is usually the easiest first clue, since pigeon coos, dove coos, and sparrow chatter all sound distinct once you know what to listen for. If you still can't tell, or you can see eggs and want to be sure before acting, get a professional up there to confirm it.
Do doves cause the same damage as pigeons? Less, generally. Doves produce fewer droppings and build a much thinner nest, so the mess and debris tend to be smaller in scale. The gap itself is still worth sealing either way, since any bird nesting there can affect airflow and leave acidic droppings behind.
Next step
Whichever bird turns out to be under your panels, the long-term fix is a custom-fit mesh barrier that seals the gap for good instead of dealing with it nest by nest. See how pigeon proofing for solar panels works, or get a quote and we'll tell you exactly what's up there.