Answer:
Habitat destruction
Explanation:
Habitat destruction is one of the greatest threats to biodiversity as it reduces the habitat available for the wildlife and thereby, even results in the extinction of many species. Habitat destruction includes conversion of forested land into agricultural lands or into any other type of non-forested area, draining of swamps, channelization of rivers, etc.
All these practices adversely affect the species that are obligatory dependent on forests. For instance, the large fraction of birds and mammalian species depend on trees for food and nesting sites. Habitat destruction due to heavy logging led to the extinction of ivory-billed woodpecker.