Males have a Y chromosome and an X chromosome while females have two X chromosome. At the very least this is true for mammals. Also males produce sperm that is meant to fertilize the eggs the females...
Yes- female gorillas have much larger breasts than the males, And they are usually the ones that look after the babies, whereas males have much flatter, broader chests (and usually have a penis as...
When they are fully feathered, the male will have feathers that curl on his tail and the female doesnt. This is how you tell if they are male or female without handling them