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Friendship is also found among animals of higher intelligence, such as higher mammals and some birds. Cross-species friendships are common between humans and domestic animals. Cross-species friendships may also occur between two non-human animals, such as dogs and cats. A study conducted by Krista McLennan, a doctoral student at Northampton University, investigated friendship in cows. McLennan measured the heart rates of cattle on three separate occasions to determine their stress levels...

Animals are a major group of multicellular, eukaryotic organisms of the kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life. Most animals are motile, meaning they can move spontaneously and independently. All animals are also heterotrophs, meaning they must ingest other organisms for sustenance...

A crocodile is any species belonging to the family Crocodylidae (sometimes classified instead as the subfamily Crocodylinae). The term can also be used more loosely to include all extant members of the order Crocodilia: i.e. the true crocodiles, the alligators and caimans (family Alligatoridae) and the gharials (family Gavialidae), as well as the Crocodylomorpha which includes prehistoric crocodile relatives and ancestors...

The crocodile shark (Pseudocarcharias kamoharai) is a species of mackerel shark and the only member of the family Pseudocarchariidae. A specialized inhabitant of the mesopelagic zone, the crocodile shark can be found worldwide in tropical waters from the surface to a depth of 590 m (1,940 ft). It performs a diel vertical migration, staying below a depth of 200 m (660 ft) during the day and ascending into shallower water at night to feed. Typically measuring only 1 m (3...

Tianjin Zoo is located in Nankai District, Tianjin, China, as the south-most part of the Water Park complex. It covers an area of 53.77 hectares (132.9 acres), which includes about 10.68 hectares (26.4 acres) of lakes. Construction began in 1975 and it was opened to the public on January 1st, 1980. It houses approximately 3,000 animals of 200 species. The zoo is divided into separate habitats for: monkeys/apes, bears, lions, pandas, songbirds, elephants, hippos/rhinos and amphibians...

The dog (Canis lupus familiaris) is a domesticated form the gray wolf, a member the Canidae family the order Carnivora. The term is used for both feral and pet varieties. The domestic dog has been the most widely kept working, hunting and companion animal in human history. The word "dog" may also mean the male a canine species, as opposed to the word "bitch" for the female the species...

The term 'Deep Sea refers to organisms that live below the photic zone of the ocean. These creatures must survive in extremely harsh conditions; such as hundreds of atmospheres of pressure, small amounts of oxygen, very little food, no sunlight, and constant, extreme cold. Most creatures have to depend on food floating down from above...

Bears are mammals of the family Ursidae. Bears are classified as caniforms, or doglike carnivorans, with the pinnipeds being their closest living relatives. Although there are only eight living species of bear, they are widespread, appearing in a wide variety of habitats throughout the Northern Hemisphere and partially in the Southern Hemisphere. Bears are found in the continents of North America, South America, Europe, and Asia...