Cetacea

Similar phylogenetic analyses also revealed that the closest living sister group to the modern cetaceans are the artiodactyls, which include animals like the giraffe and hippopotamus. More specifically, a sister-group relationship was proposed between Cetacea and Hippopotamidae by analysis of the cytochrome b gene sequences that included cetacean and Hippopotamus DNA.3 This analysis showed that there was a relationship between the two groups, but it would be deemed artifactual due to factors such as convergent

back on the skull. Eventually, the pair of nostrils positioned itself right on top of the head. These nostrils are the blowholes we see positioned on top of modern whales today. In addition, another momentous change in the nostrils occur when order Cetacea splits into Mysticetes and Odontocetes. Suborder Mysticetes

Abstract The evolution of early cetaceans (whales, dolphins and porpoises) is characterized by the appearance of aquatic behavior. The radiation of mammals constitutes one of the major morphological transitions. Most studies within the field of cetacean evolution focus on the postcranial skeleton. They come to the conclusion that a slow and gradual transition from land to water took place in the Eocene. In contrast a rapid transition is supported by vestibular evidence. However, it is still unclear

do not reproduce quickly or numerously. The Yangtze River Porpoise or the narrow-ridged finless porpoise is a small aquatic mammal that can be found exclusively in the Yangtze River. It is one of six species of porpoise and belongs to the group Cetacea, which includes all species of whales, dolphins and porpoises that are split two subgroups, the toothed whale and baleen whale mainly based on the difference between feeding styles. This porpoise falls under the toothed whale group because it feeds

Whales do not have our names on, so what makes people think it is acceptable to eat them, sell them and use their skin for our pleasure. Whales belong to the order cetacea, this includes porpoises, dolphins and whales. Whales are split into two different types being baleen and toothed whales. Baleen are the largest species of whale. With whales being the largest animals on planet, killing them is not an easy task with this making many people more encouraged to kill. Whales breathe air into lungs

DEVELOPMENT AND COMPOSITION OF MIDDLE EAR STRUCTURES OF BALAENOPTEROIDS (CETACEA, MYSTICETI): IMPLICATIONS ON FOSSIL CETACEAN PALEOECOLOGY AND BIOLOGY KERR, Tyler J., University of Wyoming, Laramie, WY, United States, 82071 BACKGROUND Whales (Cetacea) are unique among mammals in that they possess exceptionally dense, pachyosteosclerotic tympanic bullae1. Along the margin of the bulla is a highly mineralized, extremely dense wall of bone called the involucrum that serves as a special adaptation

whale, or Delphinapterus leucas, is the only member of its genus. It shares the Monodont family with one other species, Monodon monoceros, otherwise known as the narwhal. They are in the sub-order Odontoceti, which contains 74 species, and the order Cetacea, which contains 89. This in turn is part of the mammalian clade Cetartiodactyla. 3) Beluga whales are born dark gray, but within 8 years their coloration changes to a distinctive white. The species sexually dimorphic, whith males roughly 25% larger

their entire lives in water, they are air-breathing mammals whose ancestors roamed land millions of years ago. With so many interesting facts about whales, once question can be easily overlooked: Do whales have (teeth)? Whales belong to infraorder Cetacea, which includes two other ocean-dwelling mammals: porpoises and dolphins. While all whales are carnivores, that doesn’t mean all whales have (teeth). Scientists divide whales into two different parvorders based on this phenomenon: Odontoceti and Mysticeti

The animal that I choose was Bottlenose Dolphin, but if you want it scientific name is considered as a Tursiops. Bottlenose dolphins are mammals so they are warm-blooded just like human. There are so many things to talk about this species like what they do during their environment and learn about their life cycle. It is great that I am learning about my favorite animal and it turns out that dolphin are never separated from their families. Bottlenose dolphins are very joyful that like kids would

in Far North waters, New Zealand. CH Petersa* and KA Stockina aCoastal-Marine Research Group, Institute of Natural and Mathematical Sciences, Massey University, Auckland, New Zealand Worldwide inter-specific behavioural interactions in the order Cetacea are diverse and often complex. Epimelatic care can be described as nurturant or Succorant in nature. Adoption can be classified as nuturant behaviour, however very few examples of nuturant adoption have been reported among wild cetaceans and even