Owls
While not all owls are large birds, I always wondered where the bigger owls hung out during the day. The barred owl, for example, can be up to 2 feet long with a wingspan of 60 inches! Where are these dudes chilling in broad daylight? Then, suddenly, when the sun starts to sink, your start to the hear hoots in the darkness.
Eurasian Eagle Owl
Barred Owl
Snowy Owl
Barn Owl