SLEEPY-HEADS. 



All animals have their time for sleeping. "We sleep at night; 

 BO do most of the insects and birds. But there are some little 

 creatures that take such very long sleeps! When they are all 



through their summer work they crawl into winter-quarters. 

 There they stay until the cold weather is over. Large numbers of 

 frogs, bats, flies, and spiders do this. 



If they were only to sleep for the night the blood would keep 

 mov^ing in their veins, and they would breathe. But in this winter 

 sleep they do not appear to breathe, or the blood to move. Yet 

 they are alive, only in such a " dead sleep." 



But wait until the spring-time. The warm sun will wake them 

 all up again. They will come out one by one from their hiding- 

 places. 



I have told you that this sleep lasts a!! winter. But it often 

 lasts much longer than that. Frogs have been known to sleep 



