Bit late to the party but..............
Do you guys have all my bats?
I'm not seeing as many as I usually do where I am, although from my notes I had a bit of a lull around this time last year as well. The difference being last April/May was good weather and there were lots of bats around. This April/May we were still in winter.
This time of year (June and the early part of July) the female pipistrelles will be in maternity roosts with their little ones and if you're lucky enough to have one near you they'll come flooding out to feed through the night. They sometimes roost in my roof (they get either in the cavity where maybe the insulation hasn't fully filled or between the tiles and the membrane. They don't get into the loft) and when they do I've counted nearly 80 leaving at dark. Otherwise they'll sit anywhere that suits them during the day, maybe in a building but often in a tree. I think it's the horseshoe bats congregate in old buildings because they fly around to warm up before emerging. Other species don't do that.
There's a guy in my local bat group who videos them on his phone, then just ups the brightness to make everything more visible. No flashes or other lights please. Bats don't like it and may go elsewhere. Contrary to the saying, bats have good eyesight - just not good enough to home in on something the size of a midge from a distance. Stand still and they'll come very close. I've had two fly straight at my head to do a last minute break worthy of the Red Arrows. I've also heard their wings slap as they do a stall turn to catch something inches over my head. They won't hit you so long as you don't move.
They do fly regular 'beats', just like butterflies do if you've ever stood and watched them.
A heterodyne bat detector is a relatively cheap way to listen to them, especially the pipistrelles. It's addictive. With a full spectrum detector and the patience to analyse the sonograms it's surprising what you'll come across. In my village I've got common pips, soprano pips, something pretending to be a nathusius pip but must be a common pip with a low voice (nath pips are very rare but maybe because they're migratory), myotis (probably natterers), noctules, serotine, possibly leislers but I'm not convinced by that one either, and brown long eared. Nearby I have daubentons (another myotis) on the reservoir, and I've found a barbastelle, another rare one, although it's sometimes difficult to know whether a species is really rare or just under recorded. I am lucky enough to live in Somerset where we get almost every bat species found the Britain. I'm not long back from NW Scotland where it was common pip and nothing else.
For anyone interested the Bat Conservation Trust do occasional introductory Zoom talks (free) and there's lots of useful info on their web site