The banding part is meant to help with data collection. It is a good thing for the birds, I read. I wonder then, why this practice makes me feel weak?
I can’t imagine the terror the owl might experience when caught or the strange heaviness it can’t understand or remove from its leg once “successfully banded and released”. In the air, the dynamics of flight must change and then there is the worry of the band catching on something or chafing, or as a material, responding to temperature differently from the living leg it is attached to.