It had a strategy to avoid the Ding Donger, it would climb down the brick wall at a 45* angle to avoid the sensor that was placed on top of the back board, they're getting smarter, but not smart enough........
Yes, they can hear the receiver, I can hear it myself 50 ft away, what's more interesting is how they learn the ding-dong means danger
They must associate the Red LED and the ding donger with the Invisible Killer Sub-Sonic Mosquito on Steroids...(JSB .20 cal 13.73 grn), the ding dong sound opens the cage door and lets them out....... the Bigger ones are sending out the smaller siblings to test the viciousness of the Mosquito...... maybe I'll give them a break and let them think Mosquito season is over, a couple days should be good.....
That's one sad looking small dead rat. Aim small, miss small, right?