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"Animals are "multicellular, "eukaryotic "organisms of the "kingdom Animalia (also called Metazoa). Their "body plan eventually becomes fixed as they "develop, although some undergo a process of "metamorphosis later on in their "lives. Most animals are "motile, meaning they can move spontaneously and independently. Most all animals must ingest other organisms or their products for "sustenance, with the exception of those that form "symbiotic relationships with photosynthetic organisms.
Most known animal "phyla appeared in the fossil record as marine species during the "Cambrian explosion, about 542 million years ago. Animals are divided into various sub-groups, some of which are: "vertebrates ("birds, "mammals, "amphibians, "reptiles, "fish); "mollusks ("clams, "oysters, "octopuses, "squid, "snails); "arthropods ("millipedes, "centipedes, "insects, "spiders, "scorpions, "crabs, "lobsters, "shrimp); "annelids ("earthworms, "leeches); "sponges; and "jellyfish.
"Entoprocta is a "phylum of mostly "sessile aquatic animals, ranging from 0.1 to 7 millimetres (0.0039 to 0.28 in) long. Mature individuals are "goblet-shaped, on relatively long stalks. They have a "crown" of solid tentacles whose cilia generate water currents that "draw food particles towards the mouth, and both the mouth and anus lie inside the "crown". The superficially similar "Bryozoa (Ectoprocta) have the anus outside a "crown" of hollow tentacles. Most "families of entoprocts are colonial, and all but 2 of the 150 species are marine. A few solitary species can move slowly. Some species eject unfertilized "ova into the water while others keep their ova in brood chambers until they hatch, and some of these species use "placenta-like organs to nourish the developing eggs. After hatching, the "larvae swim for a short time and then settle on a surface. There they "metamorphose, and the larval gut generally rotates by up to 180°, so that the mouth and anus face upwards. Both colonial and solitary species also reproduce by "cloning — solitary species grow clones in the space between the tentacles and then release them when developed, while colonial ones produce new members from the stalks or from corridor-like "stolons. Some species of "nudibranchs ("sea slugs") and "turbellarian "flatworms prey on entoprocts. A few entoproct species have been found living in close association with other animals. It is uncertain whether any are invasive species.
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) is a "semiaquatic
to "eastern Australia
, including "Tasmania
. Together with the four species of "echidna
, it is one of the five extant
species of "monotremes
, the only mammals that lay "eggs
instead of giving birth. The animal is the sole living representative of its "family
) and "genus
), though a number of "related species
have been found in the fossil record. The unusual appearance of this egg-laying, "duck
-footed mammal baffled European naturalists when they first encountered it, with some considering it an elaborate hoax. It is one of the few "venomous mammals
, the male platypus having a "spur
on the hind foot that delivers a "venom
capable of causing severe pain to humans. Until the early 20th century, it was hunted for its fur, but it is now protected throughout its range. Although captive breeding programs have had only limited success and the platypus is vulnerable to the effects of pollution, it is not under any immediate threat.
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