 The most widely suggested original functions of feathers include thermal insulation and competitive displays, as in modern birds.All of the "Archaeopteryx" fossils come from marine sediments, and it has been suggested that wings may have helped the birds run over water in the manner of the "Jesus Christ Lizard" (common basilisk).Most recent refutations of the "from the ground up" hypothesis attempt to refute the modern version's assumption that birds are modified coelurosaurian dinosaurs.