I assumed that it was a double-entendre, referencing geese (because the Canada goose is iconic) as well as the term that means to take a look at something, as in, "I'll just have a gander at that."
I assumed that it was a double-entendre, referencing geese (because the Canada goose is iconic) as well as the term that means to take a look at something, as in, "I'll just have a gander at that."