In Leonardo da Vinci, biographer Walter Isaacson notes that da Vinci was fond of riddles, including this one: Winged creatures will support people with their feathers. This is part of a complete episode. Transcript of “Da Vinci Riddle”...
When a bird straightens and cleans its feathers with its own beak, it’s preening. If one bird is doing the same thing for another, that action is called allopreening. This is part of a complete episode. Transcript of “Allopreen” If...
The term callow goes back to Old English calu, meaning “bald.” The original sense of callow referred to young birds lacking feathers on their heads, then referred to a young man’s down cheek, and eventually came to mean...