Any signs of movement ?

This is a blip of the bowl taken this morning after it had been out all night. I checked it against the one I took yesterday evening and I really can't tell the difference.

I did think that there was some movement of the food in the bowl from one angle but it doesn't show up well on the photo.

Should I cover it up during the day or remove it altogether so that no cats can get to it ?

I couldn't get out to look much later in the evening or night because it was pouring with rain. It's quite dry where I've put the food so it should be ok.

Just waiting for the little house to turn up.