Factors affecting the distribution of the sibling species of treecreepers Certhia familiaris and C. brachydactyla in the Pyrenees

We investigated the main environmental variables determining the occurrence of the Eurasian Treecreeper Certhia familiaris and Short-toed Treecreeper C. brachydactyla within the mountain range of the Pyrenees. Presence/absence data were obtained, using the response to the playback of each species’ t...

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