The fins of the scalyhead sculpin are related to our arms.
The shape of our hands comes from tree-dwelling ancestors.
Female peacock spiders stay with their young in an egg sac until they can fend for themselves.
Infant lemurs hitch a ride through the forest by holding on to their mother’s tummy or riding piggyback.
The male peacock spider performs a spectacular dance to attract a mate—but the female is not always impressed.