I caught this little fellow in the brook that runs by the cabin. Check out his head and you'll see why they're called horny heads. Horny heads are a type of chub that only grow a few inches long and I used to love catching them as a kid. Just to gently rub the bumps on their hears, not to eat them. They're way too small for that. I let this one go seconds after I caught it.
I wonder what the evolutionary function is of those bumps…