The latest stories from the News section of the BBC Nature web site.
Teenage elephant mums 'are fitter'
Elephants that give birth as teenagers die younger, but are fitter than mothers that delay, scientists say.
Ferocious dino was European giant
Portuguese scientists identify a dinosaur that may have been the largest predator ever to roam across the European landmass.
Satellites track turtle 'lost years'
Scientists using satellite tracking finally have some data on where very young loggerhead turtles go once they leave Florida and the Gulf of Mexico.
New bird family discovered in Asia
A unique family of birds containing just one species has been discovered by researchers.
Amazon trees 'live fast, die young'
A "live fast, die young" life history strategy could have played a key role leading to the high tree diversity in the Amazon, scientists suggest.
Fishy molecule 'sets depth limit'
Scientists say it is unlikely that any fish can survive in the oceans deeper than about 8,200m.
VIDEO: Penguins make Atlantic crossing
Mike Dilger travels to Texas to accompany a group of young Gentoo penguins making the trip across the Atlantic to their new home in Hull.
Snake eats crocodile after battle
A snake wins a lengthy battle with a crocodile in northern Queensland, wrestling it, constricting it and then finally eating it.
Busting the myths of animal sleep
What do you know about animal sleep?
First images of unexplored deep sea
An expedition to the previously unexplored New Hebrides trench in the Pacific has revealed that giant eels and crustaceans teem thousands of metres beneath the waves.
Badger culls were 'ineffective'
Analysis of last year's pilot badger culls in Somerset and Gloucestershire has concluded they were ineffective and inhumane, the BBC understands.
Rare songbird faces fire ant threat
An award-winning conservation project to save the Tahiti monarch faces threats from rain, rats and fire ants.