The animal kingdom is full of surprises. From strange survival tricks to bizarre biological quirks, the weird animal facts that follow will make you look twice at the natural world.

Some are gross, some are genius—and all of them are proof that nature never stops innovating.

1. Only Female Mosquitoes Bite

Male mosquitoes feed on nectar, but only female mosquitoes bite humans and animals. They need the protein in blood to develop their eggs. So next time you're swatting, blame the maternal instinct.

2. Octopuses Have 3 Hearts

Two hearts pump blood to the gills, while one heart pumps it to the rest of the body. When they swim, the heart that serves the body actually stops, which is one reason octopuses prefer crawling over swimming.

3. Vampire Bats Can Sense Blood Flow

Vampire bats

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