I went to Miyagi that north Japan, and I watched some geese there. The theme of this article is Cackling goose. I expected that I can see this species and the expect came true. The surprising points of this birding was the number of individual. I could see so many Cackling geese! I found the large variation of plumage and unique foraging methods.
Geese were strong cautious. They alarmed not only human but also car!! They maybe recognize allogeneic or family with vision and hearing. Hearing is so important in roosting. The call of this species was different from the call of Greater white-fronted goose.
The size of white ring of neck are varied and the breast color also varied. We can see the size difference of white area of cheek from pic 5. I couldn't identify the sex but the measurement suggest that the wing length is different male to female about 50mm in Canada goose. This species molt partially in first molt.
The difference of foraging methods between Cackling goose and Greater white-fronted are apparent. By the way, we can see the difference of foraging method among Greater white-fronted, Lesser white-fronted, Cackling, Snow and Bean goose. Cackling's forage was a little similar to Chicken's one. They continue pecking ground with walking. Other species stop pecking during walking. They pecked ground one to six In a continuous and average is three. Cackling is plant feeder but not folivore. They foraged buds and seeds of grasses.
I also posted the video of foraging of Greate white-fronted goose in this time. The foraging method of the individual in right side that puting a force to the ground is not typical so please see other individuals. Greater white-fronted foraged roots, stems and leaves of grasses. I think the differences of foraging method are come from the preference of feeds.