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Tardigrades (/ ˈ t ɑːr d ɪ ɡ r eɪ d z / ⓘ), [1] known colloquially as water bears or moss piglets, [2] are a phylum of eight-legged segmented micro-animals. They were first described by the German zoologist Johann August Ephraim Goeze in 1773, who called them Kleiner Wasserbär ' little water bear ' .
With a mass of approximately 1.95 grams (0.069 oz) and a length of 5.5 centimetres (2.2 inches), the bee hummingbird (Mellisuga helenae) is the smallest known dinosaur as well as the smallest bird species, and the smallest warm-blooded vertebrate. Called the zunzuncito in its native habitat on Cuba, it is lighter than a Canadian or U.S. penny.
It contains the smallest animals ever known to have lived. Over 2,180 species have been described and some estimates have suggested at least 30,000 undiscovered species. [ 1 ] Many have a two-host lifecycle, involving a fish and an annelid worm or a bryozoan .
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A filarial nematode (roundworm) that causes a disease called Loa loa filariasis or loiasis, one of the so-called neglected diseases. [18] It is commonly known as the "African eye worm", as it localizes to the conjunctiva of the eye. It mainly inhabits rain forests in West Africa and has native origins in Ethiopia. [19]
' flat animals ') [3] is a phylum of free-living (non-parasitic) marine invertebrates. [4] [5] They are blob-like animals composed of aggregations of cells. Moving in water by ciliary motion, eating food by engulfment, reproducing by fission or budding, placozoans are described as "the simplest animals on Earth."
The royal antelope exhibits remarkable alertness, and consequently little is known about its behaviour. The animal will immediately seek cover if alarmed and flees as soon as the danger is very close. It can move swiftly, either by sprinting fast with the body low to the ground, or through strong leaps powered by the large, well-muscled hindlegs.
Angustopila dominikae is a species of light grey, round, land snails, a terrestrial pulmonate gastropod mollusc in the family Hypselostomatidae. Angustopila dominikae have been found in southern China, and are considered to be one of the world's smallest terrestrial molluscs (the holotype's shell height is 0.86 mm). [1]