The Pig Nosed Turtle 

The pig-nosed turtle or Fly River turtle, is a species of turtle native to northern Australia and southern New Guinea.
Thanks to Kiki Smith for letting us use her footage • Baby Pig-nosed Turtle ...
Pig nosed turtles are native to freshwater streams, lagoons and rivers of the Northern Territory of Australia, as well as to the island of New Guinea, where it is believed to occur in all the larger, and some smaller, southward-flowing rivers.
The pig nosed turtle is unlike any other species of freshwater turtle. The feet are flippers, resembling those of marine turtles. The nose looks like that of a pig, having the nostrils at the end of a fleshy snout, hence the common name. The carapace is typically grey or olive, with a leathery texture, while the plastron is cream-coloured. Males can be distinguished from females by their longer and narrower tails. Pig-nosed turtles can grow to about 70 to 75 cm (28 to 30 in) carapace length, with a weight of over 20 kg (44 lb).
Pig-nosed turtles are not completely aquatic. Little is known about their general behaviour, as there have been few studies in the wild. Their known extreme aggression[6] in captivity suggests the species is markedly more territorial than most other turtles and tortoises. They seem to display a degree of social structure during the cooler dry season around the hydrothermal vents that line some river systems they inhabit.
Females pig nosed turtles reach maturity at 18 or more years, and males around 16 years. They lay their eggs late in the dry season on sandy river banks. When the offspring are fully developed, they will stay inside the eggs in hibernation until conditions are suitable for emergence. Hatching may be triggered when the eggs have been flooded with water or by a sudden drop in air pressure signaling an approaching storm.
Using environmental triggers, along with vibrations created by other hatching turtles in the same clutch, gives a better chance for survival. Using a universal trigger rather than simply waiting for incubation to finish means they all hatch at the same time. This provides safety in numbers; also, the more turtles that hatch, the more help they have to dig through the sand to the surface.