Bird migrations use v-formations to reduce induced drag not parasitic drag, eg https://www.nationalgeographic.com/science/article/birds-that-fly-in-a-v-formatio

Bird migrations use v-formations to reduce induced drag not parasitic drag, eg https://www.nationalgeographic.com/science/article/birds-that-fly-in-a-v-formation-use-an-amazing-trick https://www.nationalgeographic.com/science/article/birds-tha...