This evening I joined a small group of people by the Lily Pond in Balboa Park searching for bats!
The San Diego Natural History Museum held the dusk event as part of the 2018 City Nature Challenge. The worldwide challenge–which is being held in almost 70 cities– encourages ordinary citizens to use their smartphones to record as many local flora and fauna as they can over a 4-day period. Images are submitted via the iNaturalist APP for identification! (If you want to see San Diego County’s totals thus far, here’s the link.)
Anyway, I arrived at the Lily Pond before sunset and was greeted by a couple of friendly experts representing the San Diego Natural History Museum. I was shown some cool equipment, videos and specimens, then stood by as a super sensitive microphone was turned on in order to detect the high frequency ultrasonic chirp-like noises produced by echolocating bats!
While we waited and the sky darkened, I learned a few fascinating facts. I learned that the bats most common in Balboa Park are the Mexican free-tailed bat, the hoary bat, and the western red bat. I learned some bats are solitary, and feed where insects aren’t abundant enough to support large colonies of bats. I learned bats drink by rapidly skimming above a body of water– which has been observed at the park’s lily pond. I learned some bats can fly as fast as a hundred miles per hour and as high as 10,000 feet! I also learned bats often feed around lights where flying insects gather, often live in the dead fronds of palm trees, and absolutely love hanging out under bridges.
Did we see or detect any bats? None were seen in the darkness, but the microphone did record the acoustic signature of a nearby Mexican free-tail!
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