[mou] Birdbath Question

[Ron Green]

Question for someone? We have a bird bath hanging by the feeder. 
However, the birds seem to be turning up their beaks at it even though 
we change the water daily. It does seem to get dirty rather quickly but 
we don't ever see them in it. I am beginning to wonder, based on what I 
see floating in it, if one of them is chewing tobacco and using it as a 
personal spittoon! Any ideas on what the problem is? Color? Are they 
expecting a fully tiled shower instead? Suggestions welcome.