Ive been know to mimic Birds, Ravens, Crows, Owls and hawks with my voice or combination of whistles..I have been having fun calling barred owls and great Horned Owls with my voice for years,,now is a perfect time as the great Horned owls are entering breeding season, and I have a blast laying in the snow on a moonlit nite, and call the owls to within feet of my head on an overhead branch, all the while giggling like a little kid, tricking wildlife with nothing but my voice..my friends always ask me to crow call, and I have had fellas say they have never heard a more realistic voice call.
I also use crow calls to communicate with a hunting partner of mine, he uses a raven call in return..we use this while we are still hunting deer or Snowshoe Hare hunting, rather than 2 way radios, something I despise...This is a natural woods sound that does not alarm wildlife..
Snort-Wheeze, Buck Grunts and Doe bleats by voice also come in handy, I use them religiously.
Turkey hen yelps, cackles, and putts/purrs, can be mimicked also...try it! You'll like it!