These photographs were taken in the croc-infested Northern Territory wetlands of the Adelaide River, Yellow Waters in Kakadu and Mary River National Park. The frog and freshwater croc were at Lake Kununurra, WA.

We took a boat trip on the Adelaide River, with the guide throwing bits of meat in the water to attract the crocs. Not ideal but better than not seeing them at all - or wandering around and getting too close. Apart from being so ugly, the most amazing thing is their speed. They are very, very quick. And the sound of crushing bones as they chomp through the meat is a little spine-chilling.

Mary River had just opened after the Wet Season and we were the only campervan at Point Stuart Wilderness Lodge. Far from being eaten by crocs, we should have worried more about the mosquitos which made this the most uncomfortable night we spent in Australia.