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Common bottlenose dolphins identify themselves with a unique call, but these whistles may carry extra information through variations in volume

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Female black widow spiders start eating their partner in the middle of sperm transfer during copulation, a new study shows.  Researchers in Canada have described the disturbing mating behaviour of a black widow spider species endemic to South America, called Latrodectus mirabilis.  Cannibalism between the two sexes is initiated by females 'through leg grasping and piercing during mating', they reveal from lab observations. Overall, 70 per cent of females cannibalised their first mate, they observed, but this number jumped to 85 per cent if the female had mated previously.  The freshly dec...

Mar. 16, 2021 , 8:01 PM If you’ve ever counted to three before jumping into the pool with a friend, you’ve got something in common with dolphins. The sleek marine mammals use coordinated clicks and whistles to tell each other the precise moment to perform a backflip or push a button, according to new research. That makes them the only animals besides humans known to cooperate with vocal cues. The new work is “fascinating,” says Richard Connor, a cetacean biologist at the University of Massachusetts, Dartmouth, who was not involved with the research. “We just see so much cooperation ...