1.  bird watcher(n = noun.person) ornithologist - a zoologist who studies birds;
is a kind of animal scientist, zoologist
has particulars: audubon, john james audubon, alexander wilson, wilson
Derived form verb birdwatch₁

2.  bird watcher(n = noun.person) birder - a person who identifies and studies birds in their natural habitats;
is a kind of amateur
Derived form verb birdwatch₁

adjutant bird, anseriform bird, ant bird, apodiform bird, aquatic bird, baby bird, baltimore bird, bird, bird cage, bird cherry, bird cherry tree, bird dog, bird family, bird fancier, bird feed, bird feeder, bird food, bird genus, bird louse, bird nest, bird of jove, bird of juno, bird of minerva, bird of night, bird of paradise, bird of passage, bird of prey, bird parker, bird pepper, bird sanctuary, bird shot, bird vetch, boatswain bird, bower bird, butcher bird, canary bird, caprimulgiform bird, carinate bird, cedar bird, chipping bird, clock watcher, coastal diving bird, cockyoly, bird, columbiform bird, common bird cherry, coraciiform bird, corvine bird, crocodile bird, cuculiform bird, early bird, elephant bird, european bird cherry, fire watcher, flightless bird, flying bird, frigate bird, gallinaceous bird, gallows bird, game bird, girl watcher, gooney bird, huia bird, humming bird, indigo bird, jail bird, limicoline bird, lyre bird, mallee bird, man-of-war bird, mino bird, mocking bird, mound bird, myna bird, mynah bird, myrtle bird, night bird, nonpasserine bird, oceanic bird, oscine bird, passeriform bird, peabody bird, pelagic bird, perching bird, phoebe bird, piciform bird, policeman bird, port watcher, queer bird, quetzal bird, raptorial bird, rare bird, ratite bird, rifleman bird, satin bird, scrub bird, sea bird, secretary bird, sedge bird, shore bird, tropic bird, tyrant bird, umbrella bird, wading bird, watcher, water bird, wheatsel bird, whidah bird, whydah bird, widow bird, yard bird, young bird