The use of "exclusive" seems odd there. Where did you find that sentence? Please provide a link if you can.
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AnonymousWithout more context I would interpret this to mean that the species feeds on the prey items in its environment that happen to be the most abundant at the time, or, on the prey items that are the only ones available at the time. That is, the species is not picky about what it eats: it there happens to be a lot of something available, it will eat that; if there is
petusek[Species name] feed on the most abundant or exclusive prey items but may switch to another food component when available and more suitable.There is no need to switch the word order. Though purists will consider 'exclusive' non-gradable, biologists will not be troubled by grading the adjective.