What the hell?

Stepped out last night and caught this noise coming from someplace across the pond, but centered in a couple of different regions. It surged and faded, at times going completely silent, so I’m sure it was critters of some kind, but I’m just not sure what. Take a listen before we go any further:

Noises in the night

I had to increase this by 10db and it’s still quiet – headphones read more