When compared with moms who had difficult deliveries ending in vaginal birth, women in the study who had cesarean deliveries said they had more problems getting pregnant after the birth of their first child.
Whale is the common name for a widely distributed and diverse group of fully aquatic marine mammals. They are an informal grouping within the infraorder Cetacea, excluding dolphins and porpoises, so to zoologists the grouping is paraphyletic.dontocetes feed largely on fish and squid. A few, like the sperm whale, feed on large invertebrates, such as giant squid. Grey whales are specialized for feeding on bottom-dwelling molluscs. Male whales typically mate with multiple females every year, but females only mate every two to three years.
The beluga whale (Delphinapterus leucas) is a mammal that inhabits in the Sub-Arctic and Arctic cetacean. These species are also called white whale. The beluga whale belongs to the family of Monodontidae together with the narwhal. Because of its high-pitched twitter, the beluga whale is known as sea canary.These whales can grow to a size of about 5 meters (16 feet).hese species are also called white whale. The beluga whale belongs to the family of Monodontidae together with the narwhal. Because of its high-pitched twitter, the beluga whale is known as sea canary. These whales can grow to a size of about 5 meters (16 feet).