ROYAL OAK. The Detroit Zoo is home to more than 1000 animals from almost 300 different species and is one of the first zoos to feature bar-less animal exhibits. One of the zoo's major priorities is to house its population in a more naturalistic habitat. Moats and other natural barriers separate the animals and the visitors. The zoo is wonderfully landscaped and during the warmer months it can be enjoyed aboard a miniature railroad.