Researchers observed jellyfish sleeping, suggesting the behaviour evolved before the emergence of a central nervous system in the animal kingdom.
Tiny but deadly poison frogs have a clever way to stop themselves falling prey to their own venom.
Having the most vibrant distinctive colouring enhances their chances of reproductive success.
Campi Flegrei is a large area of volcanic activity close to Naples.
The creature also represents an entirely new genus, or group of species.
The unusual behaviour may have been linked to sexual activity.
President Enrique Peña Nieto has declared three days of mourning for the second time this month.
The storm ripped trees, destroyed homes and ushered in 'catastrophic flash flooding' to the US territory.
Beelzebufo - or the devil frog as it is known - weighed around 4kg and lived 68 million years ago.
The lesser scaup rises to the challenge of competition by growing a larger penis.
The new species of prehistoric sea creature was discovered in a clay pit near Bielefeld, Germany in the 1980's.
Studying the listening abilities of birds such as the barn owl could lead to new treatments for those with hearing loss.
Maria has maximum sustained winds of 160mph and is just 15 miles east-southeast of Dominica.
The reef faces a major threat in addition to those posed by global warming and rising sea temperatures.
The amount of free oxygen on the planet skyrocketed, making the planet ideal for complex life.