We didn't evolve from monkeys, monkeys and us theoretically had a shared or common ancestor, but we fell in different directions for 'survival of the fittest.' Also, the chicken is the more close relation to the dinosaur genetically, because of the way evolution works; adaptation, variety, mutation etc. Genetics are fun, and weird, and your other examples are man-made. We're not the ever-growing humans that are doomed to get larger as everything else gets smaller, although, a lot of people sure are getting fucking fat.