Four warbler species co-occur on the Mediterranean islands of Sardinia and Corsica.The four species' diets overlap,they each look similar,and they all utilize similar habitat.Upon closer investigation it appears that each species differentially uses zones within the habitat to forage.These species

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The fact that the four species have overlapping diets and utilize similar habitats suggests that they could be competitors. However, without experimental evidence, it cannot be confirmed whether they are actually competing or undergoing niche differentiation through differential resource utilization.

Four Warbler Species Co-Occur on the Mediterranean Islands of Sardinia