Comparative endocrinology

Comparative endocrinology is concerned with the many complexities of vertebrate and invertebrate endocrine systems at the sub-molecular, molecular, cellular and organismal levels of analysis. It is an interdisciplinary knowledge in the fields of biology and medicine concerned with the morphological and functional aspects of organisms' development. The discovery of new hormones often first occurs in model organisms before orthologs are found in mammals. Provided by Wikipedia