Divergent evolution is the most commonly known of the three types of evolution. It involves one species that eventually separates into two separate species. For example, a flock of migratory birds, heading for a warmer climate, gets divided in a storm. One half of the flock continues on to the original destination. The other half lands on a new island, and decides to stay. Over time, they develop characteristics that allow them to better survive on the island, and become a different species their ancestors who were initially separated from the larger flock. What was once one species has now been separated into two.The second type of evolution -- and usually the hardest to understand is convergent evolution. Convergent evolution explains two or more species that develop similar traits in separate types of environments. Animals developing wings is one example of convergent evolution. There was no one common ancestor for all winged animals. Due to their individual environments, these animals all developed wings on their own, through generations of evolution. Wings were developed based on the physics of flying, not on a pre-programmed internal blueprint handed down from a similar ancestor.
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