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Finley, one of the sloths at The Sloth Sanctuary in Costa Rica. Credit: Ignacio Moya

Life

Sloths have double the grip strength of humans and other primates

Dangling from a tree with just a single foot, sloths can exert more gripping force relative to their weight than primates – and they are consistently, but mysteriously, stronger on their left side

News

Anole lizard on a pole

Life

Urban lizards have gene mutations that help them adapt to city life

News

Cross section of the skull (top) and outer layer of the brain, showing the subarachnoid lymphatic-like membrane in green

Health

We've just discovered a new part of the brain's waste disposal system

News

Ichthyosaur

Life

Largest ever animal may have been Triassic ichthyosaur super-predator

Features

2FM22K7 The joy is evident on the face of this young orangutan. BORNEO: THIS BRITISH photographer has spent TWENTY years snapping Borneo?s cutest orangutans.

Life

Living in trees may have given great apes vocal skills for consonants

News

A male katydid fossil from the Early Cretaceous period

Life

Fossils reveal the dinosaur era's changing insect soundscape

News

Dinosaur apocalypse

Life

Diversity helped mammals survive asteroid that killed the dinosaurs

News

How did so many giant meat-eating dinosaurs co-exist in the Jurassic?

Earth

How did so many giant meat-eating dinosaurs co-exist in the Jurassic?

Features

Ant on a small plant

Life

Ants have evolved to farm plants on at least 15 separate occasions

News

T581Y7 In vitro fertilisation, IVF macro concept

Humans

The Song of the Cell review: A love letter to life's most basic unit

From the pioneering days of IVF to modern gene editing, Siddhartha Mukherjee's ambitious book explores how far we have come in understanding the cell – and how far we still have to go

Culture

Life

How flowering plants beat bloom-free gymnosperms to world dominance

Features

Video

The sounds of animals thought to be silent...until now

Video

Life

Surprisingly bright blue fish discovered in the darkest ocean depths

News

Health

Human hibernation sounds fanciful, but it may now be saving lives

Leader