Yes, bats tend to be so loud that they leak through most filters. If the calls you are looking occur in distinct frequency ranges it might be interesting to try out sampling at 384kHz and then use a frequency trigger set to the frequency band that you are interested in. If you have some regular 384kHz recording you can try out settings in the AudioMoth Filter Playground.
Yes migrating bird calls are around around 1-10 kHz range (maybe 0.5-8). So I will test out what you suggest. Right now there seems to be very little migratory movement, so I will try in a few weeks.
Yes, bats tend to be so loud that they leak through most filters. If the calls you are looking occur in distinct frequency ranges it might be interesting to try out sampling at 384kHz and then use a frequency trigger set to the frequency band that you are interested in. If you have some regular 384kHz recording you can try out settings in the AudioMoth Filter Playground.