Marine invertebrates at various trophic levels point at an important role in many ecosystems. Echinoderms (Greek for "spiny skin") is a phylum which contains only marine invertebrates. The adults are recognizable by their radial symmetry (usually five-point) and include starfish, sea urchins, sand dollars, and sea cucumbers, as well as the sea lilies. Echinoderms are found at every ocean depth, from the intertidal zone to the abyssal zone. The phylum contains about 7000 living species, making it the second-largest grouping of deuterostomes (a superphylum), after the chordates (which include the vertebrates, such as birds, fishes, mammals, and reptiles). Echinoderms are unique among
Animal Welfare Act 2006 nutrition and veterinary care. It outlaws tail docking of dogs for cosmetic reasons, with an exemption for "working" dogs, such as those used by the police, the armed forces or as service dogs. The corresponding Act for Scotland is the Animal Health and Welfare (Scotland) Act 2006. The Act is divided into several topics. Section 1 defines an "animal" as a vertebrate (other than a human) from the sub-phylum vertebrata of the phylum chordata. A "protected" animal is defined in s2 as one that is either commonly domesticated or one that is, at the time being, under the control of