A Sinister Sound Heard During Daylight then Night Time....Hedgehogs?!

 Back in 2016, during day time, there were strange noise and at first I thought a cat had gotten itself caught in something. I went out and looked about. Nothing.

As I turned to go back into the house I heard the sound again but still saw nothing.

At night it was so loud that I had to find out what was causing the noise.

And then I found 'em!