A tiny marsupial found only in northwest Australia mates so intensely that an entire generation of males can die off during a single breeding season, researchers reported on Friday.

Biologists studying kalutas — a mouse-sized marsupial found in the arid Pilbara region — believe they die en masse because of sex-driven immune system collapse.

Female kalutas mate frequently and with different males during each breeding season.

“That means that males also have to mate a lot, and have good quality sperm (and lots of it), to outcompete

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