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 killer whale, (Orcinus orca), is the largest member of the group of marine mammals known as dolphins (family Delphinidae). They are called killer whales because they attac â¦ k and consume whales or other large prey such as seals and sea lions.General description: Adult killer whales generally grow to a length of approximately 27 feet (8.2 m). Females grow to an average length of about 23 feet (7 m).iller whales do swim in groups, they swim in pods of up to about 20. Sometimes 2 pods join up together to make an even bigger pod. Sometimes baby's and mum's stay together th â¦ eir whole lives. All the Killer Whales in the pod develop a close bond.