I've never understood why people doubt evolution. And to the question "Why can't we observe evolution in action?" We can, and we do. But because of perspective, the signs are often missed. Evolution takes thousands of years, yet we only have about 70 or so years on this planet. Our perspective is short sighted and limited. There are, however, forms of micro-evolution which have been witnessed. Bugs and butterflies which change their form adapting to the changing environment around them. Birds which have evolved on islands, such as Hawaii, which have species of birds which have evolved from other species. The cartoon and comical idea that suddenly an animal morphs into another species of animal is ludicrous. Evolution is small and slight changes that gradually happen over time. Changes such as how people in the United States have grown taller since the countries creation over 200 years ago.