Pink River Dolphin (Inia geoffrensis)

Another animal on our list of weirdest animals worldwide is the pink river dolphin. Originally born as a gray calf, the river dolphin turns pink as it reaches adulthood. Male river dolphins are usually more pink than their female counterparts. Researchers believe the males have more pink hue because they are aggressive towards themselves. 

Unlike other dolphins, the pink river dolphin can turn its head from side to side because of its separated spines. A river dolphin can grow as long as 8.5 ft. Also, it can move one of its flippers independently of the other. It improves the speed of their movement in water.

River dolphins have sensory hair on their snouts. It helps them locate prey in the deep sea. They also have two different types of teeth for various functions. The dolphin's front teeth are pointy and used to catch and hold their prey, while the back teeth are flatter. They use their back teeth to grind their food before swallowing. 

Their unique teeth formation allows them to feed on over 50 types of fish, freshwater crabs, and turtles. You can find the pink river dolphin in South America, specifically in the Amazon and Orinoco river systems.