This is one of the most common calls I take in late spring and summer: "Something is flying out from under my roofline around sunset — is it bats or birds?" At dusk, at a distance, they can look very similar. But identifying which one you have is the first step to solving the problem, because how you handle bats versus how you handle nesting birds is entirely different — including the legal rules.
The Fastest Way to Tell: Watch the Flight Pattern
If you can watch the animals for 30 seconds, flight behavior is the most reliable field ID:
🦇 Bat Flight
- Erratic, jerky, unpredictable — constantly changing direction
- Appears to "flutter" mid-air, almost helicopter-like
- Swoops low, sometimes within a few feet of the ground
- Emerges in large numbers within 10–20 minutes of dusk
- Silent visually — but you may hear high-pitched clicks if close enough
🐦 Bird Flight
- Smooth, more predictable arc — gliding between flaps
- Directional movement (flying toward a destination)
- Rarely swoops low unless feeding at ground level
- Usually 1–3 birds, not dozens simultaneously
- Audible wing beats and/or vocalizations
The simplest test: if it looks like something is malfunctioning, it's a bat. Bats are extraordinary fliers, but to the human eye their echolocation-driven micro-corrections look chaotic. Birds that haven't learned to fly yet move erratically — but adult birds flying freely are smooth.
Visual Clues at a Distance
Common Birds Mistaken for Bats in Texas
Three bird species in Central Texas are frequently confused with bats, especially at twilight:
Chimney Swifts
These are the most common misidentification. Chimney Swifts are small, fast-flying birds that winter in South America and return to Texas in spring. They nest in chimneys and have a flight pattern that looks almost bat-like — rapid, erratic, with frequent direction changes while catching insects. Unlike bats, though, they're active during daylight and you can see their brown, cigar-shaped bodies and hear their distinctive chittering calls. Chimney Swifts are federally protected under the Migratory Bird Treaty Act — their nests cannot be disturbed during nesting season (roughly April–September).
Purple Martins
Purple Martins are the largest North American swallow and prefer open areas. Their flight is swooping and acrobatic, which can look bat-like. But they're larger, have a forked tail, and are active well into daylight. They tend to roost communally in martin houses, not in building gaps.
Common Nighthawks
Nighthawks are active from dusk into the night and have erratic, swooping flight that closely mimics bats. They have a distinctive white bar on their wings, visible in decent light. Like Chimney Swifts, they're protected under the Migratory Bird Treaty Act.
Why It Matters in Texas
If you have bats: you need a bat exclusion — a one-way device that lets bats exit but not re-enter, followed by sealing all gaps. In Texas, exclusion is prohibited during maternity season (June 1 – July 31) when pups cannot fly yet. Outside that window, exclusion can proceed immediately. See our bat removal page and our bat exclusion guide for full details.
If you have birds: federal law governs most species. Active nests with eggs or young cannot be disturbed under the Migratory Bird Treaty Act. Once a nest is complete and vacated, we seal the entry point to prevent re-nesting. See our bird removal page.
The wrong approach — sealing gaps without knowing which animal you have, or during prohibited seasons — can result in trapped animals, fines, or a repeat problem within days.
Not Sure What You Have? Call for a Free ID Inspection
We'll watch your home at dusk if needed, identify the species, check for entry points, and tell you exactly what the removal plan and timeline looks like. No guessing.
Call (512) 785-6226Central Texas Context: Bats Are More Common Than You Think
Williamson County and the Georgetown area sit in one of the most bat-dense regions in North America. The Edwards Aquifer recharge zone runs through this area, and the limestone cave systems nearby host massive populations — Inner Space Cavern south of Georgetown and the Congress Avenue Bridge in Austin (home to the largest urban bat colony in the world) are both within 30 miles.
Mexican Free-tailed Bats are the species most likely to roost in homes here. Colonies grow quickly — a few bats in a soffit gap can become dozens within a summer. If you see bats exiting your home even once, it's worth a professional inspection before the colony establishes further.