many thousands of years ago prehistoric ancestors were forced to protect themselves against a larger animal even some of those that they later learned to use certain animals however such as goats or deer early man found that he could use for food probably food was one of the first uses to which animals were put one of our later ancestors and that he could tame such animals as the horse and could use them to carry burdens for him now he could travel over greater distances and carry his belongings more easily in the world about us today there are about five hundred thousand species of animals from the largest four footed beasts down to the smallest insects man has  we indicate this vast number of species by this large cube a species which man has domesticated is shown by this small cube most of these were domesticated by man before our history began have today have greatly increased the number within each of these species of animals which man has learned through ages to use also we have made specialists of domesticated animals even chickens are specialists these white leghorns specialize in supplying us with that import part of our food supply eggs other chickens are specialists in meat production here is one dressed and ready for cooking the milk of animals such as the goat as furnished food for thousands of years in many parts of the world goat's milk is especially good for children a more modern way of milking is found in this dairy barn filled with cows these cows are specialists in milk products this large herford is a specialist in beef production beef cattle are raised in vast herds on our broad western plains where grass is plentiful after being fattened they are shipped to huge packing plants such as this one in chicago where they are prepared for food under the most sanitary  conditions here we see halves of beef inside a packing house the meat can be kept for months in great refrigerators it is then sent out as there is demand for it in refrigerator cars to all parts of the country we are continually making new articles from parts of animals these are some of the products made from cattle suitcases gelatin soap handles for cutlery caught and because we do not have to supply them with food these pressure will be put on ice and will be sent to people who prefer fresh fish on the other and here are cans of salmon which will be spent long distances eventually finding their way into our homes on many pantry shelves has found another delicious food honey honey is furnished by flyer for example may carry millions of disease germs the eggs of the fly are laid in filth and waste lives are found in almost every place where people live from pills to food to fly travels carrying it's possible load of deadly disease germs in contrast to this enemy of man is the silk worm another insect valuable to man and raise mostly in japan and china here we see mold very least being fed by young s japan and china produce nearly all of the raw silk of the world but most of this raw silk is sent to the united states and when france and italy to be made into cloth after a long journey across the ocean the other animal products as well as silk are important in the trade between countries for example from australian sheep isn't in many parts of the globe mostly to your and for the united since ages past sheep have supplied people with wool for clothing after the wool is kept the sheep warm through the winter it is clipped off with shears during the warm spring weather here we see several types of clothing which are made from the snowsuit children's play clothes particularly for winter wear stocking caps and sweaters a ski suit a polo coat and even lumberjack smack and all shepherds have long used another animal the dog to take care of their flocks shepherd dogs are intelligent and well trained most dogs in the united states are pets such as this tiny terrier and huge st bernard that good hunting dogs are the result of long training and experience they locate game for the hunter and will stand for long periods quietly pointing the direction of game dogs must be very intelligent and highly trained to act as guides for the blind in many parts of the world dogs furnish power in holland they are used to draw small cartons dogs are found in all climates in the cold north they pull sleds loaded with mail and supply these laps in front of lapland have found that they can use reindeer power to know their jobs almost as well as a writer these horses are trained for the racetrack from the time they're cold race horses combine power with speed on the other hand heavy slow work is the specialty of these draft horses in the deserts of egypt and arabia camels are still the freight trains in far off india we see the cow being used to pull a heavy cart in the air leaves the world in the number of cattle and nearly all of them are used as work animals for power the water buffalo is well trained to splash through the muddy rice fields of india where machines could not operate it is estimated that today nearly four fifths of the people of the earth as shown by the dark portions of the continen still depend upon the power of animals to help them in their work and today perhaps even more than in ages past people throughout the world depend upon animals as a source of clothing and perhaps to an even greater extent as a source of food in many countries however the work of even the most powerful animals be replaced with vastly more powerful manmade machines which do the work better untiring machines are proving great disappeared the power of animals such as the camels in this age old camel train which still a lot along the highways of the orient