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Cane Toads Are Killing off Saltwater Crocodiles

You don't have to be big to kill a crocodile. A relatively small imported pest can kill one. Cane toads are in plague proportions in the Northern Territory.  Some like it so much here they have grown to be much larger than in their native Central America.
Crocodile eats cane toad
Cane toads have poisonous sacks on their heads. When a saltwater crocodile eats a toad assuming it to be a tasty snack the salty ingests the poison and dies.  The problem is so serious that the crocodile population has fallen by half in some areas. Because the species takes a long time to breed up numbers, crocodiles could become very scarce in some regions.

Introducing cane toads was a great mistake by Australian scientists. They were brought in to combat beetles destroying sugar crops in 1935, but the toads ignored the beetles and now threaten many native species by eating what they eat. To travel faster around the country some toads have developed larger hind legs to cover a greater distance before the sun goes down.
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Society by Ty Buchanan