There are about 78 types or species of whales, though this number ranges from 78 to 90 depending on the source. This group, called cetaceans, includes dolphins and porpoises, as well as whales. More »

Blue whales, gray whales, killer whales and sperm whales are some of the many species of whales. Whales are large marine mammals that are part of the cetacean order, along with dolphins and porpoises. More » Pets & Animals Marine Life

All whales, dolphins and porpoises belong to an order called cetaceans. Totaling approximately 78 species, cetaceans are divided into either of two groups: the mysticeti and the odontoceti, or baleen whales and toothed w... More »

According to, zooplankton are the prey of the majority of ocean creatures, from the smallest fishes to the largest whales. Zooplankton are considered the second step of the oceanic food web, which starts... More »

The number of chromosomes an animal has is dependent upon its species. Humans have 23 pairs of chromosomes, a fruit fly has four pairs and a dog has 39 pairs. More »

Groups of sea lions, regardless of species, have a number of different names that also identify their physical location and expected seasonal behavior. For example, when found on land, a group of sea lions is called a co... More »

The number of segments a crustacean has varies greatly depending on the species, but it is possible for all the segments of a crustacean to have appendages. The type of appendage differs according to whether it is on the... More »