Perhaps the most unexpected result was when EPCs and EPFs were documented in a burrow-nesting Procellariid, the short-tailed shearwater ("Puffinus tenuirostris"), because the female would have to leave her burrow to solicit an EPC.
Perhaps the most unexpected result was when EPCs and EPFs were documented in two burrow-nestings Procellariids, namely the short-tailed shearwater ("Puffinus tenuirostris ") and Cory's shearwater ("Calonectris diomedea borealis"). In the short-tailed shearwater, EPFs occur because the female would have to leave her burrow to solicit an EPC.