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 sperm whale (physeter macrocephalus) is a large toothed whale that is part of the cetacean species, which includes all species of whale, dolphin and porpoise.The sperm whale is the largest of the toothed whales and can grow to be as long as 67 ft. They also have the largest brain out of any animal known to exist.perm Whale Facts. The sperm whale (physeter macrocephalus) is a large toothed whale that is part of the cetacean species, which includes all species of whale, dolphin and porpoise. The sperm whale is the largest of the toothed whales and can grow to be as long as 67 ft.