👉 Infaunal refers to any animal that is alive and exhibits all of the features of the living organism. This includes both animals that are directly related to humans, such as fish, mammals, birds, reptiles, and amphibians, and those that are not directly related but share characteristics with them, such as insects, spiders, and lizards. Infaunal organisms have many unique characteristics that distinguish them from other living things. These include the ability to reproduce sexually or asexually, the