ornithologist

noun

1. A person who studies or practices ornithology.

   “Mr. Worple in his spare time was what is known as an ornithologist. He had written a book called American Birds, and was writing another, to be called More American Birds.”

   “Many of these classic methods are still used, with some modern improvements. For example, with the aid of special microphones and automated sound detection software, ornithologists recently reported […] that pine siskins (Spinus pinus) undergo an irregular, nomadic type of nocturnal migration.”