9.Sharks: Some species must keep swimming, preventing full sleep.
8.Orangutans: Rest but rarely enter deep sleep.
7.Alpine Swifts: Fly for months without landing, resting in mid-air.
6.Ants: Take micro-naps but lack extended sleep periods.
5.Bullfrogs: Stay active without typical sleep.
4.Dolphins: Rest half their brain at a time.
3.Parrotfish: Remain semi-alert to avoid predators.
2.Elephants: Sleep very little, often staying awake for days.
1.Giraffes: Sleep only 30 minutes to 2 hours daily.