Feeding birds is a popular way to watch wildlife.But many bird experts say the experience is often more pleasant to people than to birds. 1 The most common mistake people make is placing their bird feeders incorrectly.They put feeders in places where birds are scared by movements , risk being hurt by cats , or risk flying into windows.Kress , a bird expert , likes the idea of setting up a bird feeder at least one meter away from a window. 2 And , he urges owners of cats to keep them inside the home so they can ’ t hurt the birds. Learn which birds are common to your neighborhood , so you can avoid feeder wars and understand the social order. 3 They eat a lot and do not leave much food for other birds.An approach is to put the food in more than one place by using different seeds and feeders. 4 Unprotected seeds left too long in feeders will turn poisonous.Refresh your feeders every few days and clean them often with a liquid of 10 percent bleach( 漂白剂 ) . Do not feed wild birds anything salty , like potato chips , or food that could choke them , like plain bread.Always try to provide a supply of clean water , but when looking for the right birdbath( 鸟浴池 ) , you should be with care. 5 Putting a few large stones in the water can give the birds a place to sit on.For hummingbirds—which are very , very small—put water on large plant leaves to attract them.Hummingbirds like to bathe in leaves. A . Most birdbaths are too deep for birds. B . And it might even put wild birds at risk. C . Some birds are more aggressive at feeders. D . Pay attention to seed quality and freshness. E . Be careful to choose seeds of various kinds. F . So watching birds is perhaps more harmful than people thought. G . That way birds won ’ t die from hitting the glass if getting frightened.