I had heard long ago that there were two groups of Canada geese or two species. I hadn't paid much attention to this before. I knew that there were smaller Canada geese. It's not easy to tell the difference.
Cackling geese are about 25 in long and have a wing span of about 45 in. Average weight is about 3.5 lb. Canada geese are about 45 in. long , wing span 60 in and weigh about 9.8 lb. As you can see there's a big difference in size. However, it's not easy to see this in the field. Cackling geese have a much shorter neck.
There are other slight differences in markings and a big difference in sound.
I was out Nov.5 with a group of birders to Gaetz Lake. There were geese and so we had a good look. They were all the small cackling geese.
Take a look at these birds. Have you seen these differences before?