Languages
Page last updated at 09:40 GMT, Monday, 11 January 2010

Australia's freshwater crocodiles under threat

By Phil Mercer
BBC News, Sydney

A saltwater crocodile
Saltwater crocodiles are larger and more aggressive

Freshwater crocodiles are being driven out of parts of Australia's Northern Territory by their more aggressive saltwater cousins, researchers say.

Scientists believe the freshwater species could slowly be disappearing.

Government research has shown the number of freshwater crocodiles has dwindled in some Northern Territory rivers since the late 1990s.

Eating toxic cane toads is thought to be contributing to their demise, and climate change may also be a factor.

Deadly toxins

Any fight over territory between saltwater and freshwater crocodiles is likely to see only one winner.

Saltwater crocs are the world's largest reptiles, growing to average length of four metres (13ft). They are arguably Australia's most dangerous animal.

The freshwater variety, however, is far more timid and attacks on people are almost unheard of.

These smaller creatures are usually about 1.5m (5ft) long, while their diet includes fish, insects and the occasional mammal.

They will also eat poisonous cane toads, which some researchers believe is also threatening their long-term future.

Conservationist Sandy Boulter says many crocodiles have been no match for the toads' deadly toxins.

"We found a lot of freshwater crocodile carcasses and if the carcass was fresh enough we would cut it open.

"We found between one and three cane toads in the crocodiles' stomachs and the crocodile had died quite quickly and so we know that, well, one or two sizeable cane toads can kill quite a sizeable freshwater crocodile."

Others experts have suggested that the effects of warming temperatures may also be threatening the freshwater crocodile.

They are concerned that a shifting climate has the potential to disrupt the species' breeding cycle.

Under a new government management plan, the number of these reptiles in the Northern Territory that can be taken from the wild for their skins has been sharply cut.



Print Sponsor


SEE ALSO
The deadliest creatures on Earth?
27 May 09 |  In Pictures
Plan to kill saltwater crocodiles
15 Apr 09 |  Asia-Pacific
Crocodile feeding frenzy filmed
01 Mar 08 |  Science & Environment
Australian crocodile kept in cell
02 Nov 07 |  Asia-Pacific


FEATURES, VIEWS, ANALYSIS
Has China's housing bubble burst?
How the world's oldest clove tree defied an empire
Why Royal Ballet principal Sergei Polunin quit

BBC navigation

BBC © 2013 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.

Americas Africa Europe Middle East South Asia Asia Pacific