I learned something new today! 😃
“Through such trials birders develop what they call “nemesis birds,” birderspeak for the species that bedevil them again and again, despite their best efforts. As birding surges in popularity, the hobby’s unique parlance requires explanation. To “twitch” is to drop everything to chase a rare bird found outside its proper range. A “spark bird” is what birders call the bird that piques someone’s interest in birding.”
https://www.nytimes.com/2023/08/26/science/birds-birdwatching-nemesis.html