see: Bird Beaks Show Why ‘Sister’ Species Don’t Live Together http://www.sciencedaily.com/releases/2012/12/121214215042.htm
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Competitive exclusion is an interesting phenomenon. I agree it exists, but I struggle to understand what’s at play when you get extremely similar species living very closely together. Just a few examples I can think of include: BW and Laughing Kookaburras, Dusky and Red-headed honeyeaters (plus any number of other small species, all with slender beaks feeding on and fighting over the same flowers), 3-4 species of friarbirds in one location (plus ecologically similar BF honeyeaters), two spp. pardalotes together.
interesting stuff
Eric
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