The Friends of the Mount Vernon Trail are hosting an evening walk on June 19th. We'll show you:

1. The best place to watch bats on the MVT and bring out a bat microphone which identifies bat species by the frequency of their echolocation
2. A place on the trail where a beaver is reshaping the ecosystem (fingers crossed we'll get a view of this mostly nocturnal critter)
3. A place with an amazing firefly light display and the interesting science on why bats don't eat fireflies

Full details and sign up are at: