A threatened species is any species which is vulnerable to extinction in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of critical depensation, a mathematical measure of biomass related to population growth rate. This quantitative metric is one method of evaluating the degree of endangerment without direct reference to human activity.
The conservation status of a group of organisms indicates whether the group still exists and how likely the group is to become extinct in the near future. Many factors are taken into account when assessing conservation status: not simply the number of individuals remaining, but the overall increase or decrease in the population over time, breeding success rates, and known threats. Various systems of conservation status are in use at international, multi-country, national and local levels, as well as for consumer use such as sustainable seafood advisory lists and certification. The two international systems are by the International Union for Conservation of Nature (IUCN) and The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES).
Conservation in New Zealand has a history associated with both Māori and Europeans. Both groups of people caused a loss of species and both altered their behaviour to a degree after realising their effect on indigenous flora and fauna.
Chorthippus jutlandica, the Jutland bow-winged grasshopper, is a species of grasshopper in the subfamily Gomphocerinae. It is endemic to sparsely vegetated coastal sand dunes in an area covering only 87 km2 (34 sq mi) between Blåvandshuk and Hvide Sande in western Jutland, Denmark, but it is common and not considered to be under any threat.
An IUCN Red List Critically Endangered species is one that has been categorized by the International Union for Conservation of Nature as facing an extremely high risk of extinction in the wild. As of December 2023, of the 157,190 species currently on the IUCN Red List, 9,760 of those are listed as Critically Endangered, with 1,302 being possibly extinct and 67 possibly extinct in the wild.
Chorthippus brunneus, also known as the common field grasshopper, is a species of grasshopper of the subfamily Gomphocerinae. The species is common and widespread in the Western Palearctic, and the IUCN lists it as Least Concern.
Pelasgus epiroticus, or tsima, is a species of freshwater minnow in the family Cyprinidae. It is endemic to lake Pamvotis in Greece. Due to the restricted range of the species as well as the significant loss its population suffered since the early 1990s it has been assessed as critically endangered by the International Union for Conservation of Nature (IUCN).
The painted terrapin, painted batagur, or saw-jawed turtle is a species of turtles in the family Geoemydidae. It was formerly in its own genus, Callagur, but has been reclassified to the genus, Batagur.
Saga pedo is a species of wingless bush cricket from the southern half of Europe and western and central Asia. This brown or green bush cricket typically has a total length, from the head to the tip of the ovipositor, of up to 10.5 cm (4.1 in), but exceptionally it may reach 12 cm (4.7 in), which makes it one of the largest European insects and one of the world's largest Orthoptera. The head-and-body alone typically is 5–7 cm (2.0–2.8 in) long in adults, but may reach up to 7.8 cm (3.1 in).
Schayera baiulus is a species of grasshopper in the family of the Acrididae. The species is endemic to the Northern Region of Tasmania in Australia. The species is extremely rare and critically endangered, with only five confirmed specimens ever found.
The Zayante band-winged grasshopper is a species of insect in the family Acrididae. It is endemic to a small portion of the Santa Cruz Mountains in California.
An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching, invasive species, and climate change. The International Union for Conservation of Nature (IUCN) Red List lists the global conservation status of many species, and various other agencies assess the status of species within particular areas. Many nations have laws that protect conservation-reliant species which, for example, forbid hunting, restrict land development, or create protected areas. Some endangered species are the target of extensive conservation efforts such as captive breeding and habitat restoration.
Buellia asterella, commonly referred to as the starry breck lichen, is a rare, black and white lichen in the family Caliciaceae. Once found all across the central European grasslands, it was described as new to science in 1974. Today, it is classified by the IUCN Red List as Critically Endangered and only found in select regions in Norway and Germany.
Chorthippus bozdaghi, the Bozdagh grasshopper, is an endangered species of Orthoptera that is endemic to Bozdag Mountain, İzmir, Turkey. It has retreated up the mountains over time, and the habitat for this species is now small, isolated and damaged.
Chorthippus jacobsi, the Iberian field grasshopper, is a species of slant-faced grasshopper in the family Acrididae. It is found on the Iberian Peninsula.
