beautyofbirds.com

yVKEv TIL: The common birds around your yard often sleep nearby in flocks in trees, but not in nests--they abandon those soon after their eggs hatch. Birds on the edges of flocks often sleep with one eye open, including ducks that roost in water. Birds in the center sleep with both eyes shut.
7rw77 TIL the sunbittern, native to Central and South America, generally has a subdued brownish coloration while feeding. When alarmed, however, it displays its exceptional chestnut, black, and buff-yellow eyespots on the dorsal side of its wings and its colorful tail, which it uses in defensive displays.
wLAAW TIL the great argus is a species of pheasant from SE Asia. The male performs a very ostentatious mating ritual, sometimes humorously called "pick-a-card." Linnaeus named the bird owing to its intricate eye-like patterns on its wings, in reference to Argus, a 100-eyed character from Greek mythology.