Which factor presents the greatest threat to biodiversity?

The 5 Major threats to Biodiversity are : Habitat loss, Invasive species, Population, Pollution, Overexploitation (HIPPO) .  But the greatest threat is that 80%-90% of threatened species are under threat as a result of habitat loss or fragmentation.

The return of the wolf to yellowstone national park will probably affect the bird population to some degree, not significantly. while wolves will hunt birds when necessary, they prefer to hunt larger prey. the bird population will most likely only be affected when hunting is scarce for the wolves. birds of prey will also probably not be affected as much as other birds who spend more time on the ground hunting for food as the tend to spend more time in the air or in trees since they do not need to stay on the ground for long due to the nature of the way they hunt.

Iam a beginner but i sa answer is