Ice ages may have caused some species to cease their seasonal migrations
See: www.sciencedaily.com/releases/2017/09/170920144653.htm “Fly away home? Ice age may have clipped bird migration Study challenges traditional presumptions of migratory behaviour” The question is whether migratory species can become sedentary due to other pressures. Birding-Aus mailing list Birding-Aus@birding-aus.org To change settings or unsubscribe visit: birding-aus.org/mailman/listinfo/birding-aus_birding-aus.org