Fun fact about bats:
1. bats are the only mammals that can fly
2. Some People may not believe it, but bats can hunt fish.
3. Bat manure can be used to make explosives
4. Not all bat species use ultrasound, only small bat species (belonging to the Microchiroptera ) to use ultrasound waves to locate prey.
Hummingbird, this is the world's smallest bird. This is the lightest warm-blooded creature in existence. In fact, scientists argue that there cannot exist any warm blooded species that can be lighter than hummingbirds. This bird can beat its wings 50-200 times per second, this is an extremely terrible number. In addition, this bird is the only bird with a flap of wing 8, so the bird can fly in midair, fly to the sides, fly diagonally or fly backwards.