How the following animals disappeared red gazelle Caspian tiger dodo dinosaurs?

The red gazelle disappeared primarily due to habitat loss and hunting. The Caspian tiger faced extinction from habitat destruction, prey depletion, and poaching. The dodo became extinct in the late 17th century due to human hunting and the introduction of non-native species that preyed on its eggs. Dinosaurs went extinct around 66 million years ago, likely due to a catastrophic asteroid impact and volcanic activity that drastically altered the climate.