With an average of 75 crocodiles per square mile, the Tárcoles River in Costa Rica is the perfect setting for the world's highest concentration of crocodiles. This river is a popular tourist destination because of its crocodiles, believe it or not.
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Lake Malawi spans the entire coast of the eastern African nation, and is known for being home to deadly crocodiles, hippos and mosquitoes.
The Tárcoles River is home to over 2,000 crocodiles and, as such, is considered the river with the most crocodiles per square mile. But are there any other rivers that can possibly compete with this famous river? The Nile Crocodile can grow up to 20 feet long and weigh up to 1,650 pounds!
Tarcoles River - highest populations of crocodiles in world - 25 crocs per square kilometer - Picture of Jose's Crocodile River Tour, Tarcoles - Tripadvisor.
Alligators are rarely found in the Great Lakes. Although some alligators thrive in freshwater, it's just too cold in the north for them to survive. They don't typically live farther north than North Carolina. It's unclear how the alligator arrived to Lake Michigan.
Swimming in a Florida lake is generally safe, but there definitely have been people attacked and killed by alligators in Florida. Alligators are very fond of eating small animals like dogs and cats. Small children should not swim alone or be left unattended on the shore of a large Florida lake.