[microgood]

Rodents leave urine-based scent trails, but urine has a 'UV color' that these birds can see. If you were a kestrel, you could see lines of urine trails zig-zagging across the coutryside and follow a trail to find your lunch.

Thanks for that explanation. That is really cool. Seems kind of unfair, though.

[b_sharp]

"Seems kind of unfair, though."

Now you know why mice are so prolific.