Not A Bird, But Bats

[knoppers]

last night I seen two very large bats flying around, it was dusk at best, so it was plenty light still. I have seen many bats here, but nothing even close to the size of these two, if I would guess about 3 times bigger than the normal bats I see winging around. I did see the normal size bats out a little later. these two were very aggressive, dive bombing very close to me. anyone know what these species are? first time I have every seen them.