Male martens die out en masse due to too active mating.

Male northern martens spend so much time looking for females during the mating season that they hardly rest and eventually die of exhaustion. This conclusion was made by Australian zoologists. Less than ten percent of males manage to survive the breeding season. At the same time, females mostly remain in their territories and due to this they live longer: up to forty percent of them survive the first breeding season. Probably one of the main reasons for the death of animals is that they sacrifice rest and sleep for the sake of their movements.