Animals are heterotrophic, which implies they trust in other organisms—crops and/or other animals—for their foods, as they can't synthesize their own individual food as crops do by means of photosynthesis. Birds are feathered, egg-laying vertebrates, almost all of which can fly. They can be observed on each and every continent https://animalsex15047.wikiitemization.com/5174067/animal_sex_fundamentals_explained