Crocodiles team up to hunt their prey

Crocodiles are sophisticated hunters who work as a team to catch their prey and might be second only to humans in their hunting prowess, a new study has found.
Crocodiles and their relatives are highly intelligent animals capable of sophisticated behaviour such as advanced parental care, complex communication and use of tools for hunting, researchers said.
Vladimir Dinets, a research assistant professor in the University of Tennessee's Department of Psychology tapped into the power of social media to document predatory behaviour by crocodiles.
Studying predatory behaviour by crocodiles and their relatives such as alligators and caimans in the wild is notoriously difficult because they are ambush hunters, have slow metabolisms and eat much less frequently than warm-blooded animals.

To overcome these difficulties, Dinets used Facebook and other social media sites to solicit eyewitness accounts from amateur naturalists, crocodile researchers and nonscientists working with crocodiles.
He also looked through diaries of scientists and conducted more than 3,000 hours of observations himself.

The observations had something in common - coordination and collaboration among the crocodiles in hunting their prey.
"Despite having been made independently by different people on different continents, these records showed striking similarities. This suggests that the observed phenomena are real, rather than just tall tales or misinterpretation," said Dinets.
Crocodiles and alligators were observed conducting highly organised game drives. For example, crocodiles would swim in a circle around a shoal of fish, gradually making the circle tighter until the fish were forced into a tight "bait ball."

Then the crocodiles would take turns cutting across the center of the circle, snatching the fish.
Sometimes animals of different size would take up different roles. Larger alligators would drive a fish from the deeper part of a lake into the shallows, where smaller, more agile alligators would block its escape.
In one case, a huge saltwater crocodile scared a pig into running off a trail and into a lagoon where two smaller crocodiles were waiting in ambush - the circumstances suggested that the three crocodiles had anticipated each other's positions and actions without being able to see each other.

"All these observations indicate that crocodilians might belong to a very select club of hunters - just 20 or so species of animals, including humans - capable of coordinating their actions in sophisticated ways and assuming different roles according to each individual's abilities," said Dinets.
"In fact, they might be second only to humans in their hunting prowess," said Dinets.
The research is published in the journal Ethology Ecology and Evolution.