I admit, even after fish keeping for years and years, I still haven't ever really thought of fish as smart creatures. While they maybe aren't super smart, I saw my BN pleco do something pretty clever today. He is a new addition to the tank. I got him 3 days ago and he is still quite small, maybe 2.5". I dropped a nice size slice of cucumber in the tank since i have other herbivorous fish in the tank, so everyone could share. The slice was bigger than the pleco himself. Well he found it pretty quick and attatched to the top and started munching away. The tiger barbs and buenos aires tetras were pretty irritated and all just sat there flaring their fins about an inch away, looking at how they could sneak in and get a bite. After the pleco got irritated with chasing them away from his cucumber, he finally latched on top again, and started flipping his fins like crazy, and lifted the whole slice up and flipped it over on top of himself, and continued munching away on it in peace under the protection of his food blanket. Pretty cool to watch.