Nature provides different models of parenthood with the male of some species bearing the brunt of childcare.
Native American stories and legends depict crows as witty and tricky. Modern behaviorists agree; crows are one of the more intelligent bird species.
Unlike other sea turtles, the Leatherback can survive in cold waters.
The answer is diet. Those species with the most elaborate plumage also have the most diverse and reliable diet: a variety of insects, and fruits rich in complex nutrients. With this reliable food supply, females can raise the hatchlings without help from the males.
The Leatherback turtle is special because of its ability, unlike other sea turtles, to survive in cold waters.