👉 Crossopterygii is a term in zoology that refers to a group of animals characterized by their ability to live in two different environments, one in which they are closely related and the other where they are not. These animals can be found in both terrestrial and aquatic habitats. Crossopterygii generally live in close proximity to each other due to mutual migration or passing through waterways between them. Some examples of crossopterygi include the fish, sea anemones