Toucans manage their body temperature by adjusting the blood flow to their beak as more blood means more heat release. Due to this, the creatures sleep on their beak to conserve heat.

There are 5 temples in Kyoto, Japan that have blood stained ceilings. The ceilings are made from the floorboards of a castle where warriors killed themselves after a long hold-off against an army. To this day, you can still see the outlines and footprints.