Little Bats' vapour trails

There is a species of little bats, that most evenings on dusk, fly over the house here
(in Darwin, Northern Territory, Australia), sometimes down the driveway, and also
through the front patio!

In some of the video footage that I took,
I noticed that the bats were flying so fast, that they were leaving vapour trails in the air!


                               Here are a couple of photos
                               lifted from the footage,
                               which have been enhanced,
                               to more easily show
                               that there are vapour trails.
                               These were taken on 18 March 2015.

Videos  -  Little Bats 1

             -  Little Bats 2

(c) Katherine Stuart 2015

Dochas Books Film