This jaw-dropping photo of a group of sperm whales was
snapped by Tony Wu while in Sri Lanka.
He said: 'The sperm whales pictured here had just emerged from milling around in a gigantic cluster, with many of the whales defecating to such an extent that the water was opaque with secretions.
This scene was part of a large, multi-day aggregation comprising hundreds, perhaps thousands of whales.' Mr Wu won third place in the animals in their environment category for this image.
The winning image in the 'beauty of nature' category shows lightning ripping through a volcanic eruption. It was snapped by Francisco Negroni from Chile.
He said: 'This photograph was taken during a violent night eruption of the Calbuco volcano in the Lagos region, Chile. An incredible dirt storm wraps the fumarole
of the erupting volcano'