There are beaver butt secretions in your vanilla ice cream.
You’ve probably read about castoreum, which is a secretion from the anal gland of a beaver and is used in certain flavorings… such as vanilla. However, castoreum is so expensive (like $70 per pound expensive) that it probably never shows up in your food.
Plus, in 2011 the Vegetarian Resource Group wrote to five major companies who produce vanilla flavoring, and all of them said they were not allowed to use castoreum. So relax, there are no beaver glands in your sundaes.