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Heavy or light?

Life

Crows can guess the weight of an object by watching it sway in wind

New Caledonian crows are famous for their clever tool-making abilities. Now it seems they are also able to guess an object's weight by watching it move

News

A rat and a robot rat

Technology

Rats can make friends with robot rats and will rescue them when stuck

News

Find out how outrageously weird octopuses are – take our quiz

Life

Find out how outrageously weird octopuses are – take our quiz

Features

bee swarm

Life

Honeybee swarms act like superorganisms to stay together in high winds

News

fairy-wren

Life

Birds can learn to understand the meanings of other species' calls

News

sheep

Environment

Moose and sheep pass down their migration routes through culture

News

Two cleaner wrasse

Life

A species of fish has passed the mirror test for the first time

News

Meerkat standing guard

Life

The most trusted meerkats are those with impeccable reputations

News

two macaws

Life

Parrots make wise investment decisions to get what they want: walnuts

News

Orca who carried her dead infant is not alone - many animals grieve

Life

Orca who carried her dead infant is not alone - many animals grieve

A female orca has been seen carrying the body of her dead calf for 17 days, apparently grieving. Such displays of grief are remarkably common in nature

News

Environment

Lemurs self-medicate by rubbing toxic millipedes over their bottoms

News

Life

Some monkeys in Panama may have just stumbled into the Stone Age

News

Life

Crows make the right tool by remembering the last one they saw

News

Earth

Sperm whales are tracking fishing boats and stealing their fish

News