While pollution can have negative impacts on species, it is not considered a primary factor contributing to endangerment to the same extent as the other options.

The Sumatran tiger is classified as critically endangered by the IUCN Red List due to habitat loss, poaching, and human-tiger conflict.

The bald eagle was removed from the US Endangered Species List in 2007 due to successful conservation efforts.

The vaquita is primarily threatened by accidental capture in fishing nets, particularly gillnets used for catching totoaba, a valuable fish illegally traded in China.

Brazil is home to the largest number of endemic bird species, with over 1,800 species found nowhere else in the world.

The chytrid fungus, Batrachochytrium dendrobatidis, is a major cause of amphibian declines, particularly in tropical regions.

Hunting and trade regulations are not directly related to conservation strategies for protecting endangered species.

Species recovery refers to the process of restoring a species' population to a sustainable level and reducing its risk of extinction.

The dandelion is a common and widespread plant species, not considered endangered.

CITES aims to ensure that international trade in wildlife does not threaten the survival of species.

Threatened is not a category used in the IUCN Red List classification system for endangered species.

Extinct refers to a species that no longer exists on Earth.

The decline of the giant panda population is not an example of a conservation success story.

Rewilding involves introducing species to areas where they were once native but have become extinct.

Deforestation is not a major threat to marine biodiversity.