Relating to or belonging to the finch family Carduelidae, which includes goldfinches and siskins that feed on thistles and seeds.
From Latin carduus (thistle) + -ine (suffix meaning 'of or relating to'). The family name references their preference for thistle seeds as food, which shaped both their name and ecological niche.
Cardueline finches have special throat pouches that let them carry massive loads of seeds back to their nests—they can gather food up to 1,000 times a day! This adaptation is so specific to seed-eating that their entire digestive system evolved around it.
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