Macaulay, David, <br/><br/>
How machines work :  zoo break! / 
 Zoo break! 
David Macaulay. 
 - 30 pages :  color illustrations ;  29 cm. 
<br/><br/> Sloth and Sengi are friends. they have grown up together in the zoo, and know every bit of their enclosure. And, frankly, they are a little bored with it. So they begin to plan an escape, with the help of some simple machines...  This  book introduces such simple machines as levers, gears, planes, and pulleys. 
<br/><br/><label>ISBN: </label>1465440127 9781465440129 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Simple machines--Juvenile literature.<br/>Zoo animals--Juvenile literature.<br/>Toy and movable books--Specimens.
<br/><br/><label>Dewey Class. No.: </label>621.8