Just today I was doing an exterior inspection of my hives (you know, sitting there just watching them work :-D) when I noticed an occasional foul stench. I narrowed it down, or so I thought, to just one hive. Neighbors must of thought I'd gone loony watching me sniff every crack in the hive to determine the source of the odor...flip-flops, beer in hand, nose to the hive, you know the drill. Anyway, I could swear the stink was coming from the top cover so I donned the veil, opened her up, went through every frame, looked for dead critters on the bottom board etc.....nothing.
Turns out my son had cleaned fish last night and thrown the offal into the lake (30 or so feet from the hives). I guess the eyesight might be the second thing to go.