Last week, we headed to Jamaica Pond at dusk to see if we could find any bats. Two friends with a bat detector joined us. This device picks up the echolocation calls that bats use to create an image of their surroundings in the dark.
We started detecting the bats around 9:30pm on the north side of the Pond near the old Pinebank mansion. The calls got louder as the bats approached us. We even managed to see a few, although it was too dark to take photos.
We climbed the stairs and proceeded to the baseball field. More bats!
Most of the bats called at around 30 kHz which, according to this chart, makes them big brown bats. This squares with Mass Audubon, which says that big brown bats prefer urban areas.
Thanks to Kieran and Sandy for teaching us how to detect bats.