Why do amphibians have many natural enemies?

Everything is connected with the fact that amphibians live in two environments at once: water and terrestrial-air. Accordingly, the enemies are both in the water and on land. Although amphibians have more enemies on land. These are mainly various birds, reptiles and others. It is much more dangerous for a frog to be on land, as it can be caught by a snake or a large bird. It has practically no enemies in the water. Therefore, it cannot be said that amphibian enemies have twice as many natural enemies as other animals on land or in water.