Birds range in size Birds are bipedal, warm-blooded, oviparous vertebrates characterized primarily by feathers, forelimbs modified as wings, and hollow bones. a dog that is not merely a pet but learns and performs tasks to assist and/or entertain its human companions, or a breed of domestic dog Scientific classification Kingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Class: Aves Linnaeus, 1758 Orders Many - see section below. A working dog refers to a canine working animal, i.e.
This working dog is a border collie mix. Some species of fish in the world For the comedy group, see Working Dog Productions. However, hyper-saline lakes like the Great Salt Lake do not support fishes. // Fish ecology Fish can be found in almost all large bodies of water in salt, brackish or fresh water, at depths from just below the surface to several thousand meters. Endothermy, though metabolically costly, is thought to provide advantages such as increased contractile force of muscles, higher rates of central nervous system processing, and higher rates of digestion.
See also gigantothermy. The degree of endothermy varies from the billfish, which warm only their eyes and brain, to bluefin tuna and porbeagle sharks who maintain body temperatures elevated in excess of 20 °C above ambient water temperatures. All sharks in the family Lamnidae – shortfin mako, long fin mako, white, porbeagle, and salmon shark – are known to have the capacity for endothermy, and evidence suggests the trait exists in family Alopiidae (thresher sharks). Endothermic teleosts (bony fishes) are all in the suborder Scombroidei and include the billfishes, tunas, and one species of "primitive" mackerel (Gasterochisma melampus). Atlantic herring, Clupea harengus: the most abundant species of fish maintain elevated body temperatures to varying degrees.
For other uses, see Fish (disambiguation).
Pet Bed Newsworthy Section
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Pets 911
Offers hotline for lost and found pets, pictures of animals available for adoption, directory of veterinarians, and a list of animal shelters.
NOVA Online - Animal Hospital
Website for a television program. Includes information and links about animal behavior, working with problem pets, and related animal health topics.
Picturing Pets by Claire Nicholson
Unique records of family pets skillfully produced in pastel, pencil or acrylic.
Especial Els Pets
Especial de Ritmes.net, amb entrevista, enllaços, clips, jocs, salvapantalles, fotografies, fòrum, articles, efemèrides i notícies relacionades.
ideas4pets
Online pet store supplying dog cages, carriers and hutches. Order online.