A turkey is the biggest thing most people ever put in their ovens, so it's often used for oven size comparisons.

> No one cooks turkey except on Thanksgiving

There are lots of people who cook turkey only on Thanksgiving, but it is far from true that no one cooks turkey except on Thanksgiving.

I know it's not technically correct but I'm guessing that "no one" was meant to suggest "a very small percentage" which is likely accurate.

The fact that whole turkey is available year round disagrees with that statement.