Hard
Bird Riddle
NASA was considering sending canaries into space to study them under zero gravity. The project was scrapped when someone realized that in spite of having sufficient water supplies, they could die of dehydration within a few hours. Why?
Choose an answer
A.Canaries can't survive in space suits
B.Canaries need sunlight to drink
C.Zero gravity causes canaries to panic
D.Birds, unlike humans, need gravity to swallow. Humans can swallow even while hanging upside down.
Answer: Birds, unlike humans, need gravity to swallow. Humans can swallow even while hanging upside down.
Birds' swallowing mechanism relies on gravity to move water down the throat, unlike humans, so without gravity they couldn't drink despite having water.