I have had the best luck with the "Bunny Blues" or rabbit in distress...have used cow elk calls, fawn in distress but doing Bunny Blues sounds...lol on purpose...
But to be honest I have had Bunny Blues work so good that I never gave cow elk or fawn in distress a real chance...
Bunny Blues trigger that predator instict and everything comes runing from bears, cougar, yote and wolfs...to owl, hawks, magpies and crows...
Neil