Perhaps one of the most easily identified and familiar fish is the catfish. This bottom-dwelling animal has a flat head, long slender barbels that resemble a cat's whiskers, and usually has "naked" or scaleless skin. The barbels are covered with many tastebuds and when food comes in contact with them a feeding response is triggered. Catfish rely more on taste and touch than they do on sight. They are active at night, on dark cloudy days, or in murky or muddy water. Catfish are omnivores, which means they will eat practically any kind of food. Catfish have a band of teeth on the roof of their mouths that point toward their throats, making it nearly impossible for prey to escape. A sudden drastic change in water depth will send these fish into a feeding frenzy.