Plotopteridae they became extinct. That they became extinct at the same time as the giant penguins of the Southern Hemisphere, which also coincided with the radiation of the seals and dolphins, has led to speculation that the expansion of marine mammals was responsible for the extinction of the Plotopteridae, though this has not been formally tested. Plotopteridae Plotopteridae is the name of an extinct family of flightless seabirds from the order Suliformes. Related to the gannets and boobies, they exhibited remarkable convergent evolution with the penguins, particularly with the now extinct giant penguins. That they lived in the North Pacific, the
Culture of the United States Marine Corps 1868 emblem, and is depicted with wings displayed, standing upon the western hemisphere of the terrestrial globe, and holding in his beak a scroll inscribed with the Marine Corps motto ""Semper Fidelis"" with the hemisphere superimposed on a fouled anchor. The seal is displayed on a scarlet background encircled with a Navy blue band edged in a gold rope rim and inscribed "Department of the Navy, United States Marine Corps" in gold letters. Coincident with the approval of this seal by the President, the Eagle, Globe, and Anchor emblem centered on the seal was adopted in 1955 as the official