When cats are happy, they may squeeze their eyes shut.
10
Alligators can live up to 100 years.
337
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19