TIL that in the Australian marsupial Antechinus

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TIL that in the Australian marsupial Antechinus, the entire species reproduces in a single suicidal mating event: all males breed nonstop for 2–3 weeks, the stress of which causes every male to die from internal bleeding, organ failure and immune collapse.
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Sperm competition drives the evolution of suicidal reproduction in mammals - PMC

In some marsupial genera but in no other mammals, escalating stress hormones during the breeding season cause immune system collapse and synchronized death after mating in all males (suicidal reproduction). In this paper, we resolve the ...

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TIL that in the Australian marsupial Antechinus, the…

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