Green Frogs (Lithobates clamitans) are very territorial, especially the males. You can differentiate their sexes since they are dimorphic (showing observable differences in form, color, size, or structure between sexes). For example, Green Frog Lithobates clamitans Maryland Biodiversity Project About Green Frog Maryland Biodiversity Project Northern Green Frog Does Melanotan 2 Change Eye Color YouTube Northern Green Frog (Lithobates clamitans), Connecticut