Stick and Learn

There are more than 500 known shark species in the world, ranging from the enormous whale shark to the tiny cookiecutter shark.
Here are 20 shark species you might recognize or maybe a few you've never heard of before.

The Antechinus is a small Australian marsupial with a bizarre reproductive strategy. During its short breeding season, males mate repeatedly and for long periods. Their bodies produce extremely high levels of stress hormones, which can suppress their immune systems and cause severe physical deterioration.

By the end of the breeding season, most males die, often before they ever get another chance to reproduce.
So when we say it “mates itself to death,” that’s a simplified way of describing a real biological phenomenon. It’s an extreme example of semelparity—reproducing once and then dying.

Types of Land Biomes

Know your clouds

Bodies of Water