I have no idea which camera as there's quite a range capable of doing that today. I think the frame rate would be around 400 to 500 fps.
Perhaps worth a mention is the alarming back story. Bee numbers are in dramatic decline globally and pretty well everything we eat one way or another relies on bees.
"How the heck do you shoot bats at high speed at night without scaring them away with extra light?"
'cause they're blind as...:)
Actually they can see but as far as I know they are not afraid of light. They fly around at night either to hunt insects or to avoid predators or to avoid the heat as they cannot sweat.