Why are migratory species harder to protect? -They don't stay in one place long enough to be counted.
-The specific habitats along and at each end of their migration routes must be protected.
-There are too many to count.
-They migrate from one country to another.

The specific habitats along and at each end of their migration routes must be protected.

Explanation:

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms