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.
A group of whales is commonly referred to as a pod and a pod usually consists a group of whales that have bonded together either because of biological reasons (i.e. a mother baring offspring and raising her child) or through friendships developed between two or more whales.lso the social behaviors of whales can vary dramatically from species to species and depending on the particular species of whale highly social species may have many pods that contain several hundred whales or more, while lessor social species may have a dozen or less whale in their pod.