We found a wealth of information, and bat themed activities in The K-8 Aeronautics Internet Textbook, including this Marco Polo style, bat echolocation game.
One child, playing the bat, is blindfolded. While the rest, playing the insects, are not.
The bat calls out - "Insects?"
The insects answer - "Here!"
The Aeronautics site suggested calling out "beep, beep", and answering with "buzz, buzz", but the kids thought that sounded silly.
Staying within a boundary area, the bat tries to find, and tag the insects.
When insects are tagged, they must wait out the rest of the round in the bat cave. We designated the swing set as the bat cave.
The last insect to be tagged, becomes the bat in the next round.
The kids enjoyed the game, a lot more than I thought they would, especially once the Man of the House, and I joined in as insects. And, although it might not be the most scientific way to learn about echolocation, it did teach us a lot about the techniques bugs use to avoid bats.
The children naturally started exhibiting behaviours I had read about moths using, such as dropping to the ground, changing direction, and trying to send back false echoes (mainly trying to sound like they were coming from somewhere else).
For more fun with science, be sure to check out this week's Science Sunday link-up, at Adventures in Mommydom.
It's great to be a homeschooler.