Give the sunbird a few hundred thousand years---maybe a million---and some subset of them will evolve to a new species analogous to the hummingbird. Or so I would bet. The process is already begun, I would think: sunbirds that are smaller and can hover longer will get more food and have more babies. Etc.
You can read <a href="http://www.newscientist.com/article/dn16935-sunbird-learns-to-hover-for-sweet-reward.html">the (brief) article</a> at the link.
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