qT=2&tQ=Birdbaths should contain two and a half inches of water. Why?&tC=Any deeper and the birds would drown|Any less water and the birds couldn't bathe|Deep water frightens some birds|To help birds wash lice off of their feathers&cC=3&fB=Song birds rarely land on lakes and ponds, so they tend to stear clear of deep pools of water. The best birdbaths resemble rain puddles, and are shallow basins that slope slightly toward the center.