I have put out one of those drip water feeders for my wild birds and hedgehog and wonder if they will sense the water or just wonder what that human contraption is?
Birds will often see/find a water source. Because many bird species (especially songbirds) forage in flocks, they will move through a large area at a time. When one bird spots the water, others will follow.
The most natural spot for a bath is close to the ground, but water at higher levels not only appeals to some species, it reduces the bird's exposure to cat attacks. Soaking-wet birds are no match for feline agility. Putting a birdbath near trees improves security against raptors. Plus, branches are an easily reached perch from which to preen in safety. Locate your bath in a shady part of your yard. This will keep the water at a cooler, more refreshing temperature in hot weather. To get birds accustomed to the bath, try placing a feeder within five feet of the bath. Birds will notice the water as they go to the feeder. Birdbath water should be changed every few days to insure a fresh, clear supply. Place our birdbath fillers in a bath to ensure birds have a safe footing. Do these things, and birds will flock to your "community pool".
It may take a day or so, but they will smell it. Ever been hiking and smelt or felt the river or waterfall nearby before you could see or hear it? Maybe it has something to do with the moisture in the air. Their senses are way sharper than ours. If water is plentiful in your area I don't think you will get much of a show of wild animals. But, as long as there aren't any cats or dogs around to harass the birds, I'd expect you to have a regular group in no time.
Birds' hearing and eyesight are very attuned to the environment. The birds will see and hear the water which will lead them to your water feeder.