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Kangaskhan. For many years this pokémon sparked the curiosity of scientists al over the world. Because when a Kangaskhan it will be carrying a "baby" right from the bat. However the truth is that the "baby" is no more than a male Kangaskhan.
Kangaskhan presents a big case of sexual dimorphism. While the female ones are big and strong individuals, the males ones have weak bodys and can't fend for themselves.
Everytime a Kangaskhan ovulates, it ejects two eggs. One male, one female, every time, that remain together inside the egg. While in the development, the male one follows his natural instints and climbs up the female one's pouch and stays there, for his entire life.
During many years it was though to be a children because of the motherly care Kangaskhan treated his twin. The male Kangaskhan feeds himself by sucking milk from his sister's breasts and she never loses it from sight. In fact, this relationship goes further. They can't live without each other. If the female Kangaskhan is killed in combat, the male one, with his weak body will eventually perish. If male Kangaskhan dies or is lost, the female one will enter in a deep depression state, refusing to eat, eventually dying. There are a few registed cases of female Kangaskhan going mad over losing her twin and trying to steal a new one from another Kangaskhan but those attempts are almost always unsucessfull, often resulting in the dead of the attacker.