Endangered Animals:
Animals that begin to die as they cannot adjust themselves to environmental changes, resulting in their population becoming very small, are called endangered animals. This term is used to describe species that are at risk of extinction in the near future.

Explanation:
When an animal species is unable to adapt to changes in their environment, such as habitat loss, climate change, or introduction of invasive species, their population starts to decline. If this decline continues and the population becomes very small, the species is considered endangered. There are several key factors that contribute to an animal species becoming endangered.

1. Habitat Loss: One of the primary reasons for species becoming endangered is the loss of their natural habitat. Human activities such as deforestation, urbanization, and the conversion of natural land for agriculture and infrastructure, result in the destruction and fragmentation of ecosystems. This directly affects the survival and reproduction of many species.

2. Poaching and Illegal Wildlife Trade: The illegal hunting and trade of animals and their body parts for various purposes, such as traditional medicine, exotic pets, or luxury products, is a major threat to many species. This unregulated activity can cause a rapid decline in their population and push them towards extinction.

3. Pollution and Climate Change: Pollution, including air and water pollution, as well as climate change, have significant impacts on animal species. These environmental changes can disrupt ecosystems, affect the availability of food and resources, and alter the reproductive patterns of species, making it difficult for them to survive.

4. Invasive Species: The introduction of non-native species into an ecosystem can have detrimental effects on indigenous animals. Invasive species often outcompete native species for resources, prey on them, or disrupt their natural behavior, ultimately leading to population decline.

5. Genetic Factors: Some animal species have naturally small populations or limited genetic diversity, which makes them more vulnerable to environmental changes. These genetic factors can increase their risk of extinction as they may lack the necessary genetic variations to adapt and survive.

To protect endangered species, conservation efforts are crucial. These efforts involve habitat preservation, captive breeding programs, regulation and enforcement of anti-poaching laws, and raising awareness about the importance of biodiversity conservation. By addressing the factors that lead to endangerment, we can work towards preventing the loss of these valuable animal species.