An animal behaviour expert gives his view on finding that a killer whale can copy the sound 'hello'.
Hey, what about us? Whale shark (spotted) and manta ray, a close shark relative.
As the Discovery Channel and National Geographic Wild unleash a week of dueling shark programs, a biologist advises viewers to take what they see with a large grain of sea salt.
Remembering a giant haunted by tragedy.
No more breeding, but still on exhibit.
The history of displaying exotic animals seems to be one of evolving public expectations about what constitutes acceptable conditions. Is it a case of the more things change, the more they stay the same?
Mike Blake / Reuters
No one wants animals to suffer, but it is notoriously difficult to measure their welfare.
Documentaries are fragile things, easily blown into obscurity or silenced by the sheer weight of corporate power.