Mesker Park Zoo and Botanic Garden welcome two new members to its family. A male and female Mexican gray wolf arrived today. They are the most endangered wolf species in the world. These wolves were released into the recently renovated wolf exhibit today. They have already had two litters of pups in the past two years. There are only about 300 Mexican gray wolves in captivity, and 60 to 70 in the wild in Arizona and New Mexico.