(this is my own question that i know the answer to im a equstrian with 2 horses ok) there is a boy horse a man horse and a female horse what are their genders called all 3 of them

Ascientist is designing an investigation to study the impact of invasive bird populations on local, native bird populations at backyard bird feeders. what population is most likely to be a control group for the investigation? amount of food number of bird feeders invasive bird populations local backyard birdfeeders without food