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It is known that modern mysticetes have teeth initially and then develop baleen plate germs in utero, but lose their dentition and have only baleen during their juvenile years and adulthood. However, developing mysticetes do not produce tooth enamel because at some point this trait evolved to become a pseudogene. This is likely to have occurred ...
Baleen whales have no teeth; instead, they have plates of baleen, fringe-like structures that enable them to expel the huge mouthfuls of water they take in while retaining the krill and plankton they feed on. Because their heads are enormous—making up as much as 40% of their total body mass—and they have throat pleats that enable them to ...
A professional diver captured a rare video at the beginning of June of a group of sperm whales 'cuddling'. Kayleigh was having a lucky day using a drone for the first time when she noticed the ...
The skim-feeders are right whales, gray whales, pygmy right whales, and sei whales (which also lunge feed). To feed, skim-feeders swim with an open mouth, filling it with water and prey. Prey must occur in sufficient numbers to trigger the whale's interest, be within a certain size range so that the baleen plates can filter it, and be slow ...
Scientists think they might have finally learned the secret to how whales sing their complicated songs. We knew whales made a vast array of vocalizations, called songs, that can carry for ...
Reproduction and Life Cycles. Blue whales breed in the warmer, tropical waters during the winter or early spring. After a gestation period that lasts nearly a year, the female blue whale gives ...
Mysticetes do not have phonic lip structure. Instead, they have a larynx that appears to play a role in sound production, as it has vocal folds (vocal "cord") homologs in the U-shaped fold supported by arytenoid cartilages. [39] Whales do not have to exhale in order to produce sound, as they capture the air in a laryngeal sac.
Generally their teeth have evolved to catch fish, squid or other marine invertebrates, not for chewing them, so prey is swallowed whole. Teeth are shaped like cones (dolphins and sperm whales), spades , pegs , tusks or variable (beaked whale males). Female beaked whales' teeth are hidden in the gums and are not visible, and most male beaked ...