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18 hours ago · The tail fin would have been crescent-shaped, the anal fin and second dorsal fin would have been small, and there would have been a caudal keel present on either side of the tail fin (on the caudal peduncle). This build is common in other large aquatic animals, such as whales, tuna, and other sharks, in order to reduce drag while swimming. The ...
- †O. megalodon
- †Otodus
18 hours ago · Distribution of narwhal populations. The narwhal ( Monodon monoceros ), is a species of toothed whale, and the only member of the genus Monodon. The most prominent feature of the species is an adult male's long single tusk that can be up to 3 m (9.8 ft). The narwhal has a mottled pigmentation, with blackish-brown markings over a white background.
18 hours ago · Scallop (/ ˈ s k ɒ l ə p, ˈ s k æ l ə p /) is a common name that encompasses various species of marine bivalve mollusks in the taxonomic family Pectinidae, the scallops.However, the common name "scallop" is also sometimes applied to species in other closely related families within the superfamily Pectinoidea, which also includes the thorny oysters.
18 hours ago · Is the evolution of fish into terrestrial animals a second time? Do fish that walk on shore evolve limbs? In the long history of the earth, the evolution of life has always been full of mysteries and miracles.
3 hours ago · Godzilla's roar has evolved over the years — the original sound resembled a shrill "Skreeeonk!" as described in Dark Horse's "Godzilla" comics, and went on to alternate between deep, guttural ...
18 hours ago · For them, the reproductive tract is doubled. The females have two uteri and two vaginas, and before birth, a birth canal forms between them, the median vagina. In most species, males have a split or double penis lying in front of the scrotum, which is not homologous to the scrotum of placental mammals.
18 hours ago · The largest dinosaurs, and the largest animals to ever live on land, were the plant-eating, long-necked Sauropoda. The tallest and heaviest sauropod known from a complete skeleton is a specimen of an immature Giraffatitan discovered in Tanzania between 1907 and 1912, now mounted in the Museum für Naturkunde of Berlin.
