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The Etruscan shrew has a very fast heart beating rate, up to 1511 beats/min (25 beats/s) and a relatively large heart muscle mass, 1.2% of body weight. [3] The fur color on the back and sides is pale brown, but is light gray on the stomach. The fur becomes denser and thicker from fall through the winter. [8]
The animal's faeces come in the form of small pellets. [17] When it has access to water, a giraffe will go no more than three days without drinking. [43] Giraffes have a great effect on the trees that they feed on, delaying the growth of young trees for some years and giving "waistlines" to particularly tall trees.
All other mammals have seven cervical vertebrae, [14] other than the two-toed and three-toed sloths. Like the horse, the manatee has a simple stomach, but a large cecum, in which it can digest tough plant matter. Generally, the intestines are about 45 meters, unusually long for an animal of the manatee's size. [15]
Over 1.5 million living animal species have been described, of which around 1.05 million are insects, over 85,000 are molluscs, and around 65,000 are vertebrates. It has been estimated there are as many as 7.77 million animal species on Earth. Animal body lengths range from 8.5 μm (0.00033 in) to 33.6 m (110 ft).
The dental formula is: 5.1.3.4 4.1.3.4 × 2 = 50 teeth. By mammalian standards, this is an unusually full jaw. The incisors are very small, the canines large, and the molars are tricuspid. Didelphimorphs have a plantigrade stance (feet flat on the ground) and the hind feet have an opposable digit with no claw.
Size of Paraceratherium (dark grey) compared to a human and other rhinos (though one study suggests Palaeoloxodon namadicus may have been a larger land mammal). The blue whale is the largest mammal of all time, with the longest known specimen being 33 m (108.3 ft) long and the heaviest weighted specimen being 190 tonnes.
Peccaries have a complex stomach that contains four compartments. [34] Their fore stomach has fermentation carried out by microbes and has high levels of volatile fatty acid ; it has been proposed that their complex fore-stomach is a means to slow digestive passage and increase digestive efficiency. [ 34 ]
The wolverine's questionable reputation as an insatiable glutton (reflected in its Latin genus name Gulo, meaning "glutton") may be in part due to a false etymology.The less common name for the animal in Norwegian, fjellfross, meaning "mountain cat", is thought to have worked its way into German as Vielfraß, [5] which means "glutton" (literally "devours much").