This 2015 video from Canada is called Red Crossbills Singing and Feeding.
From the Cornell Lab of Ornithology in the USA:
A Bird Like No Other
Red Crossbills are endlessly fascinating: they have a can opener for a beak, they “speak” at least 10 different dialects, and they sometimes abruptly leave their home forests to travel hundreds of miles away. In a newly revised Birds of North America account, crossbill experts compile decades of first-hand knowledge to present an authoritative picture of this captivating bird—including first-of-their kind maps of call types and irruption movements that were a decade in the making.
Explore Red Crossbill biology in depth with free access all month to this groundbreaking Birds of North America account.
Dear Kitty. Some blog 