Glossary – reference – a-z animals gas x dosage for dogs

The conservation status of a species is an indicator of the likelihood of that species remaining extant either in the present day or the near future. Many factors are taken into account when assessing the conservation status of a species: not simply the number remaining, but the overall increase or decrease in the population over time, breeding success rates and known threats. Scientifically, animals come into 9 different categories which are least concern, near threatened, conservation dependent, threatened, vulnerable, endangered, critically endangered, extinct in the wild and extinct. A-Z Animals groups the animals into just four different categories which are least concern (covering the categories least concern, near threatened and conservation dependent), threatened (covering the categories threatened and vulnerable), endangered (covering the categories endangered, critically endangered and extinct in the wild) and extinct.

Least Concern is a category assigned to extant species which have been evaluated but do not qualify for any other category. Many common species are assigned to the least concern category but the species has to have been evaluated to be classified in the least concern category.• Near Threatened is a conservation status assigned to species that may be considered threatened with extinction in the near future, although it does not currently qualify for the threatened status. As such it is important to re-evaluate Near Threatened species often or at appropriate intervals.• Conservation Dependent is a category assigned to extant species that rely on conservation efforts to prevent them from being threatened from extinction.• Threatened species are any species of living organism which are vulnerable to extinction in the near future. The World Conservation Union (IUCN) is the main authority on threatened species, and treats threatened species not as a single category, but as a group of three categories: vulnerable, endangered, and critically endangered, depending on the degree to which they are threatened.• Vulnerable species are species which are likely to become endangered unless the circumstances threatening their survival and reproduction improve.• Endangered species are a population of organisms which are at risk of becoming extinct because they are either few in numbers, or threatened by environmental changes or changes in the behaviours of their predators. Many nations have laws offering protection to conservation reliant species: for example, forbidding hunting, restricting land development or creating preserves. Only a few of the many species at risk of extinction actually make it to the lists and obtain legal protection. Many more species become extinct, or potentially will become extinct, without gaining public notice.• Critically Endangered species are organisms that are of an extremely high risk of becoming extinct in the wild or completely extinct in the immediate future.• Extinct in the Wild is a conservation status assigned to species where the only known living members are being kept in captivity or as a naturalized population outside it’s historic and natural range.• Extinct species no longer exist anywhere on Earth. The moment of extinction is generally considered to be the death of the last individual of that species.

An animal food chain is the sequence of who eats whom within an ecosystem in order for each animal to obtain nutrition. A food chain starts with the primary energy source, which is usually the sun and the food chain is then connected by a series of organisms that eat each other, in turn. The food chain starts with the sun and is then followed by the primary producers, then the primary consumer, then the secondary consumer, followed by the tertiary consumer and finishing with the quaternary consumer which is generally an animal that is eaten by nothing else and is therefore the end of the food chain. Food chains are never the same as each ecosystem contains different organisms within it. If one part of the food chain is missing then there will be high population levels in the links before the missing part of the food chain, as nothing is eating them, and there will also be lower population levels in the links after the missing part in the food chain, as those animals have nothing to eat. The food chain is then said to be out of balance, so it is crucial for food chains to remain unaltered in order for balance within the animal kingdom to remain.