The basic mammalian body type is quadruped, and most mammals use their four extremities for terrestrial locomotion; but in some, the extremities are adapted for life at sea, in the air, in trees, underground, or on two legs. Mammals range in size from the 30–40 mm (1.2–1.6 in) bumblebee bat to the 30 m (98 ft) blue whale—possibly the largest animal to have ever lived. Maximum lifespan varies from two years for the shrew to 211 years for the bowhead whale. All modern mammals give birth to live young, except the five species of monotremes, which are egg-laying mammals. The most species-rich group of mammals, the infraclass called placentals, have a placenta, which enables the feeding of the fetus during gestation.
Domestication of many types of mammals by humans played a major role in the Neolithic Revolution, and resulted in farming replacing hunting and gathering as the primary source of food for humans. This led to a major restructuring of human societies from nomadic to sedentary, with more co-operation among larger and larger groups, and ultimately the development of the first civilizations. Domesticated mammals provided, and continue to provide, power for transport and agriculture, as well as food (meat and dairy products), fur, and leather. Mammals are also hunted and raced for sport, kept as pets and working animals of various types, and are used as model organisms in science. Mammals have been depicted in art since Paleolithic times, and appear in literature, film, mythology, and religion. Decline in numbers and extinction of many mammals is primarily driven by human poaching and habitat destruction, primarily deforestation. (Full article...)
The Blue Whale (Balaenoptera musculus) is a marine mammal belonging to the suborder of baleen whales. At up to 33 metres (110 ft) in length and 181 metric tonnes (200 short tons) or more in weight, it is believed to be the largest animal to have ever lived, though some fragmentary dinosaur discoveries such as the colossal Amphicoelias fragillimus may challenge this long-held belief. Long and slender, the Blue Whale's body can be various shades of bluish-gray. There are at least three distinct subspecies: B. m. musculus of the north Atlantic and north Pacific, B. m. intermedia, of the Southern Ocean and B. m. brevicauda (also known as the Pygmy Blue Whale) found in the Indian Ocean and South Pacific Ocean. B. m. indica found in the Indian Ocean, may be another subspecies. As with other baleen whales, its diet consists mainly of small crustaceans known as krill, as well as small fish and squid. lue Whales were abundant in nearly all oceans until the beginning of the twentieth century. For over 40 years they were hunted almost to extinction by whalers until protected by the international community in 1966. A 2002 report estimated there were 5,000 to 12,000 Blue Whales worldwide located in at least five groups. More recent research into the Pygmy subspecies suggests this may be an underestimate. Before whaling the largest population was in the Antarctic, numbering approximately 239,000 (range 202,000 to 311,000). There remain only much smaller (around 2,000) concentrations in each of the North-East Pacific, Antarctic, and Indian Ocean groups. There are two more groups in the North Atlantic and at least two in the Southern Hemisphere.
...that one burrow of the eastern chipmunk(pictured) was found to contain 390 acorns?
.. that the Hare Indian dog, now extinct, was not known to bark, but puppies learned to imitate the barking of other dogs when the breed was introduced to Europe?
The culpeo (Lycalopex culpaeus, aka Andean fox/wolf) is the second-largest native canid in South America. It has grey and reddish fur, a white chin, reddish legs, and a stripe on its back that may be barely visible. The mean weight for males is 11.4 kg (25 lb), while females average 8.4 kg (19 lb).
The northern palm squirrel (Funambulus pennantii) is a species of rodent in the family Sciuridae. It has a wide distribution in the Indian subcontinent and Iran, being a semi-arboreal species found in dry deciduous forest and many other rural and urban habitats. It is a common species with a wide range and the International Union for Conservation of Nature has rated its conservation status as being of least concern. This northern palm squirrel was photographed in Keoladeo National Park in Bharatpur, in the Indian state of Rajasthan.
Close-up of a juvenile Southern Elephant Seal (Mirounga leonina), showing face and mouth detail. This species of elephant seal is not only the most massive pinniped, but also the largest member of the order Carnivora living today. It is found throughout the subantarctic region.
Male lion (Panthera leo) and cub eating a Cape buffalo in Northern Sabi Sand, South Africa. Lions are true predators who can require an average of up to seven kilograms (15 lbs) of meat daily to survive. Large mammals comprise an important part of a lion's diet.
The eastern bettong (Bettongia gaimardi) is a marsupial whose natural range includes south-eastern Australia (where it has been extirpated) and the eastern part of Tasmania. Sometimes referred to as a "rat-kangaroo", it is relatively small, rarely exceeding 2 kg (4.4 lb), but will travel up to 1.5 km (0.93 mi) from its nest to find food.
Skull of a male North Sulawesi babirusa, a species from the pig family endemic to Indonesia. Babirusas are notable for the long upper canines in the males that emerge vertically from the alveolar process, penetrating though the skin and curving backward over the front of the face and towards the forehead.
The tule elk (Cervus canadensis nannodes) is a subspecies of elk found only in California, seen here at Tomales Point in Point Reyes National Seashore. When Europeans arrived in the area, an estimated 500,000 tule elk roamed these regions, but the animals were thought to have been hunted to extinction by 1870. A single pair was discovered on the ranch of the cattle baron Henry Miller in 1874. He ordered his men to protect them, and is credited with the survival of the subspecies. As of 2019, the total Californian population is estimated to be 5,700.
Two pot-bellied pigs sleeping. This breed of domestic pig belongs to the same species as the Wild Boar and the common farm pig (Sus domestica), and originated in Vietnam. Most adult pot-bellied pigs are about the size of a medium- or large-breed dog, though their bodies are denser at a weight of 60 to 300 pounds (27 to 136 kg).
The southern plains gray langur (Semnopithecus dussumieri) is a species of Old World monkey native to the Indian subcontinent. It is about 62 cm (24 in) tall and lives in groups in various forest habitats, feeding mainly on leaves, fruit and flowers in the canopy, supplementing these with insects, gum, grasses, herbs and roots. The monkeys are considered sacred in India, and some are used by Hindu priests for religious purposes. They have adapted to living in close proximity to humans in urban settings; they are often fed by humans and accept cakes, millet, and other foods. The species is protected by law in India, but some are still persecuted for damaging crops, hunted for food and captured for pets.
This photograph of a female southern plains gray langur was taken in Kanha Tiger Reserve, in the Indian state of Madhya Pradesh. The park was created on 1 June 1955 and was designated a tiger reserve in 1973.
Two olive baboons (Papio anubis) engaged in social grooming, an activity that social animals (including humans) engage in to clean or maintain one another's body or appearance. Grooming also reinforces social structures, family links, and builds relationships. It has been best studied among primates, but insects, birds, fish, and other mammals are known to engage in it as well.
A female Parma Wallaby (Macropus parma) and her joey. This wallaby species is the smallest member of the genus Macropus, at between 3.2 and 5.8 kilograms (7.1 and 12.8 lb) and about 50 centimetres (1.6 ft) in length. It was believed to be extinct before the end of the 19th century, but a population was found on Kawau Island in 1965, and two years later another population was found in the forests near Gosford, New South Wales. They are now classified as Near Threatened.
A portrait of a cheetah at Whipsnade Zoo in Bedfordshire. Cheetahs have small and streamlined heads. Their ears are small, short, and rounded, marked by black patches on the back and tawny edges. Their high-set eyes have round pupils, while their whiskers are fine and inconspicuous. Their faces have unique "tear streak" markings that may serve to reduce glare or define facial expressions.
The Nova Scotia Duck Tolling Retriever is a medium-sized retrieverdog breed that originated in southwestern Nova Scotia, Canada. It is named for its ability to lure waterfowl within gunshot range, called "tolling". It is particularly suited for retrieving in cold water climates because of its water-repellent double coat.
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