The TV personality Steve Irwin, who was nicknamed The Crocodile Hunter, but died in 2006, took part in the study.

BBC: Crocodiles 'surf' long distance on ocean currents

But the last word on Steve Irwin seemed to belong to Africa's greatest crocodile-hunter, Khalid Hassen, bagger of 17, 000 crocs the easy way, with a rifle, who said it simply didn't seem right that a fish should have killed him.

ECONOMIST: Steve Irwin

Among the speakers were US actors Hayek and Matthew McConaughey, award-winning scientist and environmentalist Dr David Suzuki, Canadian astronaut Julie Payette and Bindi Irwin, the young daughter of the late Australian wildlife expert, Steve Irwin.

BBC: 'Space clown' hosts global show