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Mass migration occurs in mammals such as the Serengeti 'great migration', [31] an annual circular pattern of movement with some 1.7 million wildebeest and hundreds of thousands of other large game animals, including gazelles and zebra. [32] [33] More than 20 such species engage, or used to engage, in mass migrations. [34]
Marine mammals form a diverse group of 129 species that rely on the ocean for their existence. [5] [6] They are an informal group unified only by their reliance on marine environments for feeding. [7] Despite the diversity in anatomy seen between groups, improved foraging efficiency has been the main driver in their evolution.
Amphibians like frogs and toads can vocalise using vibrating tissues in airflow. For example, frogs use vocal sacs and an air-recycling system to make sound, while pipid frogs use laryngeal muscles to produce an implosion of air and create clicking noise. [7] Aquatic mammals such as seals and otters can produce sound using the larynx.
Class Mammalia (mammals) Subclass Prototheria (Monotremata, egg-laying mammals) Subclass Theria (metatheria (such as marsupials) and eutheria (such as placental mammals)) This rather orderly scheme is the one most commonly found in popular and basic scientific works.
The largest living amphibian is the 1.8 m (5 ft 11 in) South China giant salamander (Andrias sligoi), but this is dwarfed by prehistoric temnospondyls such as Mastodonsaurus which could reach up to 6 m (20 ft) in length. [7] The study of amphibians is called batrachology, while the study of both reptiles and amphibians is called herpetology.
Marine mammals are aquatic mammals that rely on the ocean for their existence. They include animals such as sea lions, whales, dugongs, sea otters and polar bears. Like other aquatic mammals, they do not represent a biological grouping. [26] The humpback whale is a fully aquatic marine mammal.
Social monogamy in mammals is defined as sexually mature adult organisms living in pairs. [1] While there are many definitions of social monogamy, this social organization can be found in invertebrates, reptiles and amphibians, fish, birds, mammals, and humans. [2]
A mammal (from Latin mamma 'breast') [1] is a vertebrate animal of the class Mammalia (/ m ə ˈ m eɪ l i. ə /).Mammals are characterised by the presence of milk-producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair, and three middle ear bones.