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I suppose this an example of convergent evolution, where animals that are not closely related develop similar characteristics, while adapting to similar environments. Another convergent pair of species would be the dolphin and the ichthyosaurs, one being a mammal and the other reptilian, yet both developed an almost identical body style, 100 million years apart.
Since we have only planet to base our theories on, all this is only speculation as Racnad said. Other planets may evolve similar evolutionary convergence, or go in some direction that know one ever dreamed of. They could not all be stranger than we imagine, they could be stranger than we can imagine.
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