Dryer vent cover to keep birds out
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In the other photo, I was at a school, and pigeons were entering an open roof vent and living in the duct work, making nests and pooping, and many of the birds died. This actually caused a health risk for the school, because pigeon droppings can grow mold and fungus that can cause lung infections.
Lighter material, such as plastic netting or window screening, rarely keeps determined starlings out. Any vent covering you use for starlings should be checked periodically to make sure the vent is working properly and is not impeded by a build-up of any material, such as lint from a dryer. Vent Covers on Amazon.com. Identifying an active nest