Postmenopausal orcas seem to prevent sons from getting into fights
20 July 2023
Male orcas with a surviving postmenopausal mother have fewer signs of injury than those whose mothers are dead or still reproducing
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Giving birth at an older age is linked to a longer life in women
14 July 2023
Every additional year before a woman gives birth to her last child is associated with an extra 22 days of life
First over-the-counter birth control pill approved in the US
13 July 2023
The US Food and Drug Administration approved the oral contraceptive Opill for use without a prescription. It is the first hormonal contraceptive available over the counter in the US
Birds from two different species raise chicks together in one nest
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A pair of common redstarts and a pair of black redstarts were seen brooding in the same nest in Italy – a kind of cooperative breeding that has never been documented before
Male spider mites rip off females’ skin to be first to mate with them
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Due to fierce competition for mates, male spider mites guard juvenile females and forcibly remove their skin as they near adulthood so they can secure the first mating
Crocodiles can reproduce without males – and maybe dinosaurs could too
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An egg laid by a female American crocodile with no access to males developed into a fully formed fetus in the first known case of "virgin birth" in a crocodilian
One-off injection may provide lifetime contraception for female cats
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The long-pursued goal of a permanent, one-dose contraceptive may have been achieved in female cats and it should work in other species too
Beetles that receive less care as larvae may become better parents
19 April 2023
An experiment with beetles suggests that those deprived of nurture in their early life may devote more time to helping their own offspring
Male crazy ants have two different sets of DNA in their bodies
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A bizarre mode of reproduction discovered in yellow crazy ants results in males that have two separate sets of DNA in different parts of their body
Invasive Burmese python in Florida lays a record 96 eggs in one go
4 April 2023
A female Burmese python – an invasive species in the US – has laid a clutch of 96 eggs in one go, almost double the average for these snakes
