The world of out-of-doors is full of secrets．And they are so interesting that quite a lot of people are busy studying them．All around us are birds, animals, trees and flowers．The facts about how they 1 and grow are as interesting as anything could be．
Do you know that one of the great presidents of the USA spent hours and hours 2 birds? A businessman who lives near New York city became in 3 in insects that he began to collect them．He now has more than one thousand different kinds carefully 4 is glass boxes．
Come then with me, and I will help you find some of nature’s secrets．Let us go 5 through the woods and fields．Here we shall find how a rabbit tells other rabbits that there is danger．We shall 6 a mother bear and her young ones as they look for 7 and get ready for winter sleep．We shall watch bees dancing in the air to let other bees know 8 they can find food．I will show you many other interesting things, but the thing that I can 9 you is to keep your eyes and ears 10 when you go out of doors．Nature tells her secrets only to people who look and listen carefully．