This type of mating behavior, where a generation of males die off in their first season, is very rare in the animal kingdom.
Researchers have fascinating new details of the extreme and unusual mating habits of the kaluta —a tiny, mouse-sized marsupial which is only found in the arid Pilbara region of northwestern Australia., kaluta males die en masse after a single breeding season, which causes them so much stress and exhaustion that the immune systems of the animals fail.
"That means that males also have to mate a lot, and have good quality sperm—and lots of it—to outcompete rival males. This intense investment in reproduction, evidenced by their large testes, appears to be fatal for males," Hayes said. In fact, scientists only know a few dozen species that mate in this way, most of which—unlike kalutas—are invertebrates, or animals without a backbone,Kalutas belong to the animal family Dasyuridae of marsupial mammals which contains around 60 species, including the famous Tasmanian Devil. According to the researchers, around a fifth of the species in this family exhibit male semelparity—the only mammals to do so.
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