Cave rats make urine trails throughout the deep, dark caverns of the caves, which tell the rats how to find their way in the dark.

A species of dolphin is born naturally blind in the Indus and Ganges rivers in South Asia. These dolphins have a highly sophisticated sonar system and swim on only one side of their body.

Whales love to sing! They use this as a call to mates, a way to communicate and also just for fun! After a period of time they get bored of the same whale song and begin to sing a different tune.

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