Other hawks, eagles, owls can prey on them. The Goshawk is well known for removing any competitors from it's territory, even larger species. Large owls sometimes take hawks that are roosting at night or even when they are incubating eggs. Any type of cat, or dog, or marten, indeed any carnivorous mammal.
Transverse waves is the secondary wave.
Autotrophs are organisms that can produce their own food from the substances available in their surroundings using light (photosynthesis) or chemical energy (chemo-synthesis). Heterotrophs cannot synthesize their own food and rely on other organisms, both plants and animals for nutrition. hope this helps :)
