Right now, we don't have anyone that has volunteered to do Tuesdays for Trivia. (Friday is also open and The weekend is open to anyone that wants to post a question) Until someone decides to join the fun, I will post a puzzle type question on at least some Tuesdays. I know that some don't like these kinds of questions, so I will restrict them to Tuesdays to make them easier to ignore ;-)
Here is an easy one to start out.
An eagle, an elephant, and a walleye each have two. A tiger, a moose, a bear, a turtle, and a snake have one. Humans, birds, cats, and dogs don't have any. What are they?