Home Newsroom News Archive News Archive Skip filter form Search Term Sort by RelevanceDate Filter By By Animal - + Aldabra tortoise Alpaca American bison Andean bear Aquatic caecilian Asian elephant Asian small-clawed otter Bennett's wallaby Black-footed ferret California sea lion Channel catfish Cheetah Chicken (-) Common raven Corals and sea anemones (anthozoa) Cow Dama gazelle Eastern newt Eastern red-backed salamander Eld's deer Fennec fox Giant panda Goat Golden lion tamarin Gray seal Gray wolf Guam kingfisher (sihek) Guam rail (ko’ko’) Harbor seal Hawk-headed parrot Lion Maned wolf Miniature donkey Naked mole-rat North American porcupine Orangutan Ossabaw Island hog Panamanian golden frog Patagonian mara Prehensile-tailed porcupine Przewalski's horse Red panda Scimitar-horned oryx Screaming hairy armadillo Sloth bear Tentacled snake Tiger Two-toed sloth Western lowland gorilla White-cheeked gibbon White-nosed coati Whooping crane No result By Year - + (-) 2018 Displaying 1 - 1 of 1 articles. March 07, 2018 Two Species of Ravens Nevermore? In a new study almost 20 years in the making, Smithsonian researchers and partners report some of the strongest evidence yet of the phenomenon of speciation reversal in two lineages of common ravens.