Assertion: bulbul's population | /r/CapableOf | reach equilibrium
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text: On the other hand, there is no reason to suppose that the native species is an inferior competitor; rather the two bulbuls' populations soon seem to reach an equilibrium: on Katchall the red-whiskered bulbul was established in the 1910s or so already, and this has not prevented healthy Nicobar bulbul stocks from persisting on that island to the present day.