Chickadees, nuthatches in Quebec, Canada

This video from Canada says about itself:

Birds of Quebec: Black-capped Chickadee, White-breasted Nuthatch and Red-breasted Nuthatch

1 February 2018

Scientists have found that hybrid chickadees have marked deficiencies in learning and memory compared to their pure species parents, a possible selective disadvantage. The study is the first to identify deficiencies in learning and memory in a hybrid of any species: here.