You'll notice smaller birds need to feed more frequently for their size than larger birds. A crow or hawk requires meals that total just 4-12% of their weight while the tiny chickadee, needs to eat 35% of its weight in a day. And hummingbirds drink about 100% of their body weight per day.
Birds of prey can eat just once a day. Birds eating seed, bugs, suet or nuts high in protein and fats may have to venture out from the roosting spots every couple hours. Frugivorous or fruit eaters will spend long periods of their day feeding because most fruits are not high in protein or calories. Nectar feeding birds have the highest metabolic rates of any bird, ingesting small meals roughly every 15–20 minutes.
Bird "Goosebumps" https://bird-goosebumps.html
Chickadees are stashing food https://chickadees--stash-food.html
A bird's beaks https://birds-beak-continues-to-grow.html
Birds can predict bad weather https://sudden-activity-at-bird-feeder.html
A Great Horned Owl hunt https://great-horned-owl-hunts.html
Birds sleep in short bursts https://birds sleep in short bursts.html
Northern Shrikes are the world's only true carnivorous songbirds https://songbird-of-prey.html