We have an automatic drinker system set up for the quail, where we have a bucket and a series of tubes which take water to drinking troughs inside the hutches. Yesterday when I went into the garden, I noticed that one of the tubes had a few small holes in it. I suspected that a cat might have been in the garden and might have chewed at the pipes. I put some tape over the tube to stop the leak, and scattered some 'cat repellent' pellets in the garden.
This morning I noticed that something had chewed the end off one of the tubes. Whatever did it, it must have been frustrated by not being able to get at the birds. If it was a cat, then either it has lost its sense of smell, or our cat repellent has stopped working.
It's a bit of a pain because we will have to replace the tubing and get something to make it cat proof. I'm assuming it's a cat rather than a fox because we often see cats prowling around the gardens. The few occasions when we've seen foxes in the area, they have always been in the roads between our house and the nearby fields.