Rhinoceros can weigh up to a ton, but are actually herbivores. The African rhinoceros doesn't even have teeth. Their thick shell or armor is made of collagen and can be 1.5 centimeters thick. The male deer or buck has antlers that are covered in velvet and filled with nerves and blood vessels. Unfortunately both of these beautiful animals are considered trophies for their beautiful horns. It's much safer and easier to color a picture of them and hang it on your wall as a trophy. Excerpted with permission from <a href="https://www.amazon.com/gp/product/076416872X/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=076416872X&linkCode=as2&tag=craftfocom-20&linkId=8eee75c1a8232d94dfcdbb2865431d5b">Beautiful Pictures to Color and Frame: Features 40 Stunning and Original Artworks!</a> Need advice on improving your coloring skills? Check out <a href="http://www.craftfoxes.com/blog/the-best-videos-to-learn-adult-coloring-book-techniques">The Best Videos to Learn Adult Coloring Book Techniques</a>.