Sex in animals

The ways in breeding animals, are totally different between different species.

Here are some of them.

In the case of amphibians, although they are coupled at the time of replication, its external fertilization is because the male has no penis. They mounted a female until they deposited eggs (a process that can go on for several days) and watering them with his sperm.

In birds, the male usually placed over the female, join sewers (only holes, which serve both for the sperm to excrement) and transferred semen to the female genital organs. In the waterfowl, including ducks, geese, swans and other, the male has developed a small penis hidden that excels in sexual intercourse.

Almost all male reptiles have penis; crocodile and turtle male, is very similar to that of mammals, lizards and snakes look but one that actually are two, although only part of the side that tap. This turns upside down and is fixed to the female. They store the sperm and use it at intervals, until several months or even years later.

In mammals, it is usual that the male to female mountain behind, do some pelvic movements, ejaculation and withdraw. The cópulas of cats, as cats, lions, tigers, among others, are very violent because they withdraw to its member, the male tears tissues of the vagina of the female. But this movement is necessary so that the ovary release the egg.

However, it is not always necessary two to be perpetuated. The crustaceans (such as crab or shrimp), gastropods (such as snail), celentéreos (such as hydro) and lamellibranch (such as clam and mussel), are hermaphroditic: each individual has a sex gland that produces eggs and sperm to once, although it is usual that two of them together to exchange their sexual products.

The inbred is less common, but perform some parasites like tapeworm, due to their special living conditions, or species with few individuals with whom they crossed.

Finally, the most radical feminism is the parthenogenesis. This form of reproduction only creates beings of the same sex as its progenitor: females. Worker bees and ants, the queen if needed, resort to this asexuada reproduction.

Ultimately, other animals differ from us in their sexual behavior is stereotyped for each species. The wide variety of records they do not take no longer ultimately a conflict between the approach and withdrawal, submission and the threat, the collection and dispersal.