He also advise people to avoid killing snakes, as they're crucial to the environment and are beneficial to getting rid of rodents. The Barred Owl is known for its distinctive who-cooks-for-you call, and even if you cant see it, youll likely be able to identify it just based on its sound. Northern Mockingbirds are very defensive birds, and they wont hesitate to attack cats and humans that come too close to their nests. There are approximately 450 species of vertebrate wildlife which can be found within the Garden State, along with 85 freshwater fish.