Evening Grosbeak Coccothraustes vespertinus
International Road to Recovery Evening Grosbeak Working Group: Look into population declines, assortative mating, morphometrics, flight call variations and genetics for all call types, but especially with Type 1 which overlaps with all the other call types to some degree.
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Red Crossbill Loxia curvirostra
Call types of the North American and Western Palearctic populations.
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Rosy-finches:
Nesting requirements and the impacts of climate change, and wintering range distributions of the various species.
Lean more https://finchnetwork.org/the-rosy-finch-project
Hawaii’s Finches, The Honeycreeper Project:
Four Hawaiian honeycreeper species have been pushed to the edge of extinction and are in need of your help: the endangered ‘akikiki (Oreomystis bairdi) and ‘akeke‘e (Loxops caeruleirostris) on Kaua‘i Island, and kiwikiu (Pseudonestor xanthophrys) and ‘ākohekohe (Palmeria dolei) on Maui Island.
https://finchnetwork.org/the-honeycreeper-project
The Purple Finch Project:
Field recording and study of the differences between Type 1 (western) and Type 2 (eastern) Purple Finches.
https://finchnetwork.org/the-purple-finch-project
Redpoll complex
Arbiters of visual identification of redpolls species based on photos for this worldwide cryptic species complex.
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Hawfinch Coccothraustes coccothraustes
Call types of the Palearctic populations.
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Eurasian Bullfinch Pyrrhula pyrrhula
Call types and taxonomic status of the Palearctic populations.
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Common Rosefinch Carpodacus erythrinus
Function of the two different song types.
Learn more: LINK