Hunting - Many species are hunted for food, fur or other body parts. This can lead to a rapid decline in their populations, especially if they are also facing other threats such as habitat loss.
Pollution - Pollution from human activities can damage or destroy habitats, and can also poison wildlife. This can lead to health problems, reproductive problems, and even death.
Climate change - Climate change is causing the Earth's climate to change rapidly, which is disrupting ecosystems and making it difficult for many species to adapt. This can lead to declines in their populations and an increased risk of extinction.
Invasive species - Invasive species are non-native species that have been introduced to an area and can cause harm to native species. They can compete with native species for food and resources, transmit diseases, and even prey on them.
Overfishing - Overfishing is when fish are caught faster than they can reproduce. This can lead to a collapse of fish populations, which can have a ripple effect on the entire ecosystem.
Poaching - Poaching is the illegal hunting of animals. It is a major threat to many endangered species, especially those that are valuable for their fur, skin or meat.