North Korea

Dog ticks feed on dogs and other mammals

The owl can rotate its head some 270 degrees

Has up to 45 eggs per egg case

The Ural owl can rotate its head up to 270 degrees

Freshwater eels are actually catadromous, meaning they migrate to saltwater to spawn

Can live its entire life indoors

European adders are the only snake that lives above the Arctic Circle.

This vulture can fly at great heights. At least one was found a few thousand feet from the top of Mount Everest.

The Eurasian jay has the ability to mimic other sounds

It's one of the most commonly eaten fish in the world

The checkered keelback of the east Indies can detach its tail and grow it back, much like a lizard.

Many hawk moth caterpillars eat toxins from plants, but don’t sequester them the way milkweed butterflies do. Most toxins are excreted.

Pupae are able to undergo diapause to survive poor fruit yield years and winter.

Teachers in schools often use the evolution of the peppered moth as a good example of Darwin’s theory of natural selection.

Vipers are one of the most widespread groups of snakes and inhabit most

Pit vipers's fangs fold up into their mouths when they don't need them.

Asian lady beetles infest indoor spaces, but they do not reproduce indoors.

The goldcrest never starts moving and needs to consume for most of the day to survive. Therefore, in the colder months, it's best that eat 90% a day.