Based on what you learned about the creation of the mockingjay, why is the bird a perfect symbol for a revo-
lution against the Capitol?

The Capitol tried to eliminate all the birds, but these birds has already reproduced with various wild mockingbirds. And this is how the mockingjay was created. It's a sign of how the capitol failed to be successful with their plans, and the bird is for that reason, a perfect symbol for the revolution.

a dictionary is the correct answer

yes, it can be both.