Sloths urinate and defecate around once a week because their bodies take that long to digest the food they eat.
Bees, butterflies, moths and beetles are on the decline in Europe. Flying insects are essential pollinators for food security and agriculture.
Photojournalist Brent Stirton has been named Wildlife Photographer of the Year 2017 for his shocking image of a black rhino killed by poachers for its horns.
Over millions of years, large herbivores such as certain dinosaurs may have played a crucial role in dispersing vital nutrients across continents.
Over 110 generations, males who had to compete with other males for female attention were able to produce more seductive melodies.
The stunning helicopter footage shows two of the huge marsupials punching and kicking at each other as another watches nearby.
The unusual behaviour is the first documented evidence of widespread interaction between the freshwater and saltwater animals.
Dolphin and whale societies are about as sophisticated as our own. They talk, have names, form allegiances, hunt together and work with other species. All they lack is thumbs.
Storm Ophelia is set to hit Ireland and parts of the UK with gusts of up to 80mph from the Atlantic, causing schools and airports to close.
The program at China Conservation and Research Centre for the Giant Panda has its most successful year ever, with 42 cubs born in 2017.
The gruesome "undertaking behaviours" were found to increase the chances of a new colony succeeding.
Fossils dismissed in the 1970s as a common species have now been identified as a new kind of ichthyosaur. Researchers made the discovery after exposing evidence of fakery.
Recent research suggests that around half of all dogs and cats in the UK are obese - and the problem is only expected to grow over the coming years.
The survey documents the whereabouts of 31,000 vertebrates, highlighting regions around the world where biodiversity is particularly under threat.
Tropical storm brought powerful winds and severe flooding to the southern US states after Nate landed near the mouth of the Mississippi River.
Scientists have found a way to predict when Old Faithful will blow its top, sending steam up to 180 feet into the air.
UK government's surprise decision to ban the sale and export of almost all ivory followed high-profile campaigning from Prince William, Ricky Gervais and Stephen Hawking.
Neonicotinoids contaminate the majority of honey in the world. Almost half of all honey samples contained more than one neonicotinoid.
British wildlife photographer Chris Brunskill captured the predators' violent struggle while travelling in Mato Grosso, Brazil.
Researchers think each of the new species are confined to the individual limestone blocks where they were found.
The salamander has an incredible level of detail preserved, including its spinal cord, gut, muscle and glands. Its last meal of a frog is also still visible in its stomach.
A fossil belonging to the 'Melksham Monster' had been sitting in the archives of the Natural History Museum for nearly 150 years before being identified as a new species.
More than 140,000 people have fled the region in recent weeks.
The meal could have been the ichthyosaur's first and last. Let's hope it was good.
Darwin believed that life started forming on Earth after meteorites crashed into 'warm little ponds'.
Petition supported by local bird charity has since been set up by the 'Pigeon Embassy'.
Zealandia is believed to have broken off from Australia and Antarctica around 80 million years ago.
Researchers describe the event as the biggest, unplanned, natural experiment in marine biology history.
Researchers think they have identified the evolutionary process behind this transformation.
Along with white, bull and whaler sharks, a Bryde's whale was seen hunting bait fish very close to shore.