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Hace 1 día · Ornithischia (/ ˌ ɔːr n ə ˈ θ ɪ s k i. ə /) is an extinct clade of mainly herbivorous dinosaurs characterized by a pelvic structure superficially similar to that of birds. The name Ornithischia, or "bird-hipped", reflects this similarity and is derived from the Greek stem ornith-(ὀρνιθ-), meaning "bird", and ischion (ἴσχιον), meaning "hip".
Hace 8 horas · The narwhal (Monodon monoceros) is a species of toothed whale and the only member of the genus Monodon.Its closest living relative is the beluga whale, and a single case of interbreeding between the two species has been recorded. It is sexually dimorphic, as adult males are larger and have a single tusk that can be up to 3 m (9.8 ft) long. . Several theories have been proposed for the function ...
