Bird nests inside dryer or bathroom vents are more common than you think—especially during spring and early summer. If you hear chirping, scratching, or flapping noises near your vents, it's a strong indicator that birds have moved in. You may also notice visible debris, twigs, or feathers around the exterior vent cover.

Blocked airflow, unusually long drying times, or a persistent musty smell from your dryer or bathroom fan can also signal a hidden nest. In some cases, nests can even lead to mold growth or pose a fire risk. If you notice any of these signs, it’s important to schedule a professional removal and cleaning as soon as possible.