Foraging again when the crop is about empty. They catch flies, ants, small beetles, tiny wasps and other small insects. Nectar and sometimes tree sap. They need the insects for protein and nectar for energy. Sugar mixture for home feeders should only be 1 part white sugar to 4 parts water.
Hummingbird eyes are large, immobile with both monocular and binocular vision.
Both eyes will typically outweigh the brain. They have more feathers per square inch than any other bird. They have no down feathers. Many feathers are iridescent and require sunlight to show colors. Hummingbirds do perch, they don't walk.