Hummingbirds can also fly upside down.

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In spotted jellyfish, sperm is sucked into the females mouthlet to fertilize the eggs within

Fire ants bite and sting by clinging onto the skin with their jaws while repeatedly injecting venom with their stinger

image of a blue banded bee

Blue Banded Bees Are Antisocial

Fireflies glow to attract mates

The Mexican or Brazilian free-tailed bat, can reach speeds of 100 mph (160 km/h) and can fly at an altitude of 10,800 ft (3,300 m) 

Glass frogs have transparent abdominal skin that make the heart, liver, and digestive tract visible