that loon is a aquatic bird

Yes, belM, I was expecting that. Hang on, I just found the second definition:

Main Entry: loon
Function: noun
Etymology: of Scandinavian origin; akin to Old Norse lOmr loon
Date: 1634
: any of several large birds (genus Gavia) of Holarctic regions that feed on fish by diving and have their legs placed far back under the body for optimal locomotion underwater


"optimal locomotion underwater"
"feed on fish"

Do you think hoons or chooks have their legs placed further back under the body?