The rivalry manifested itself in Barnum’s advertisements. He plastered the country with large bills, reading, “Wait for Barnum. Don’t spend your money on inferior shows.” He also attacked competitors in his program notes, and when he chronicled the glory of his curiosities he frequently offered rewards for those who could honestly equal them. In 1879 he promised $10,000 “to any person who can show that the bare expenses of running my establishments during the last six years has not averaged more than _the entire gross receipts_ of any other show during the same time, which has ever traveled either in this country or Europe, and in making this offer I promise every facility for learning the facts.” Barnum was proud of his menagerie and sure of its preëminence. He printed the following offer: “While most exhibitions advertise more animals than they possess, and many which the advertisers never saw, I hereby solemnly agree to forfeit and pay $50,000.00 if the proprietors of any Menagerie now in the country can show that they have incurred the same expense, and if an equal number of rare wild animals was ever before seen in any traveling exhibition in this country or in Europe, or anywhere on the face of the whole earth. I am thoroughly in earnest in making this proposition, and pledge my honor and my money for its due fulfilment.” This magnificent menagerie included, “the only Two-Horned Rhinoceros ever exhibited in America, which cost me $16,000.00”; a Black, Double-Humped Camel, “as dark as Erebus,” and “by his side in strong contrast, another Double-Humped Camel perfectly White.” Then there was “the remarkable anomalous pachyderm from the interior of Africa, which even the savants of Europe have not been able to classify. It has the head of the hippopotamus, the tusk of the elephant, the hide of the rhinoceros, the body of the lion, and the feet of a camel. It weighs nearly two tons and has been named from its peculiar form and strange combination, the ELEPHANTUS-HIPPO-PARADOXUS; as it paradoxically combines several animals in one.” The zoölogical boast continued: