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In open, blue ocean water, a tuna fish (at left) rubs the back half of its body against the tail of a shark, facing the camera at center

Life

Tuna use sharks as back scratchers despite risk of being eaten

Large yellowfin tuna fish prefer to scrape against sharks over members of their own species, possibly to pry off parasites

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The world is full of living gold, which is more valuable than riches

Life

The world is full of living gold, which is more valuable than riches

Comment

Female robin

Life

51��s finally realised female robins sing just as well as males

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Toy car with flag on a pole in front of a herd of cows

Environment

A remote-controlled car with a flag on a pole can herd cattle

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Life reconstruction of Edmontosaurus

Life

Mummified dinosaur has bite marks and gashes in its skin

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Erect crested penguins

Life

Erect-crested penguins always reject their first egg and lay another

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A transplanted human organoid labeled with a fluorescent protein in a section of the rat brain. Credit: Stanford University.

Life

Human neurons transplanted into a rat's brain influence its behaviour

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Brown howler monkeys in open grassland

Life

Monkeys and lemurs are coming down from the trees as climate warms up

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A captive monkey scooping up water with a leaf

Life

High-ranking monkeys are more prone to gain weight in captivity

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A sloth with a coconutty head

Life

Newly recognised species of sloth has a head like a coconut

Maned sloths were thought to be one species but a genetic and physical analysis suggests there are actually two

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Life

Lemurs hug tree trunks to cool down when temperatures top 30°C

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Life

Cheetahs are back in India but conservationists have doubts over plan

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Technology

Face recognition technology for pigs could improve welfare on farms

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Life

Ant-slayer spider catches prey with acrobatic leap to wrap it in silk

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