birdwatcher

US /ˈbɝːdˌwɑː.tʃɚ/
UK /ˈbɝːdˌwɑː.tʃɚ/
1.

birdwatcher

someone who studies birds in their natural environment as a hobby:

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To the trained eye of a birdwatcher, no two eagles look the same.
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birdwatching