Bats or birds would have to be glowing in the dark for digital Nv monocular
to record them that well... if it was thermal it would be a different story
Most birds caught on NV are pretty low flying in pretty light polluted areas
Geese for example can look very bright in a Image intensifier nv,s and even better in digital nv... I actually filmed bats awhile ago using the the Yukons illumination
but with the infra red turned off couldn't see em and they were only flying about 30 feet above me
... these cant be bats Canner could still possibly be large birds mind you but Most unlikely in my opinion....