We have a flock of about 50 of these guys that hunt worms on our lawn every day. They're really fun to watch. They must have amazing hearing, because they seem to be able to hear the worms crawling under the soil.
I don't know what science has to say about how smart they are, but they definitely seem to always know what they are doing. They have such complex behavior and are extremely efficient at eating and nesting. Indeed really fun to watch!
I've watched one cock its head towards a spot on the lawn, listen, then dart over, slam its beak into the ground with the full force of its body, and come back up with a big ol fat worm. It's really neat.