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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Nesting requirements and the impacts of climate change, and wintering range distributions of the various species.

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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.

The Purple Finch Project:

Field recording and study of the differences between Type 1 (western) and Type 2 (eastern) Purple Finches.

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.
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