Karen Graham Introduction of non-native animals that prey on iguanas or compete with iguanas for resources. Dogs, cats, pigs, and rats prey on iguanas and their eggs. Indian mongooses have been introduced in a futile attempt to control rats, but instead have killed an untold number of native species, including juvenile iguanas. A biologist traps mongoose in Jamaica to prevent them from further damaging the iguana's ecosystem. Rick Hudson Goats, sheep, cattle, and other livestock have contributed to the deterioration of the unique plant communities on which iguanas and other native species depend.
Desertification caused by feral goats leaves little food or shelter for native animals .
On some islands, iguanas are hunted for food, while illegal poaching for international trade is becoming an increasing concern on others.