melierax canorus or musicus

from The Collaborative International Dictionary of English v.0.48

Chanting \Chant"ing\ (ch[.a]nt"[i^]ng), n.
   Singing, esp. as a chant is sung.
   [1913 Webster]

   {Chanting falcon} (Zool.), an African falcon ({Melierax
      canorus or musicus}). The male has the habit, remarkable
      in a bird of prey, of singing to his mate, while she is
      incubating.
      [1913 Webster]