Cats recognise the voice of their owner, but never evolved to care.
22
Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
23
A 42-foot sperm whale has about 7 tons of oil in it.
209
Dolphins have names for one another.
18
The Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
12
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20