Black teeth may remind you of cavities, but in the case of fur seals, it is a sign of good health.
Black teeth are caused by the presence of good bacteria that produce black pigment in the mouth.
When they are born, their teeth are white, but as they age, they turn black.

The dolphin has a smooth eggplant-like skin to reduce water resistance so that it can swim faster. Incidentally, dolphins renew their skin every two hours.

It looks like it has bones in it, but it is made of hard feathers.

The name "Tokay" comes from the fact that it cries "Tokay. There is a legend that if you hear this cry seven times in a row, you will be happy.

Of the 18 species of penguins in the world, only the gentoo penguin has yellow feet. Look at their feet.