ink-the-crow:facts-i-just-made-up:Bird bones are made from a substance called “Aerogel” that keeps t
ink-the-crow:facts-i-just-made-up:Bird bones are made from a substance called “Aerogel” that keeps their weight down so they can fly.This Crow skull weighs only half an ounce (150 grams) yet it can shield the animal’s brain from impacts with nearly any surface. The only substance hard enough to fracture bird skulls is the house window, their natural predator.False, I don’t have bones -- source link