Who new that one different shade could tell us so much about a birds evolutionary history....

References:

Ducatez, S., Giraudeau, M., Thebaud, C., & Jacquin, L. (2017). Colour polymorphism is associated with lower extinction risk in birds. Global Change Biology, 23(8), 3030-3039.

Ruzicka, F., Zwoinska, M. K., Goedert, D., Kokko, H., Li Richter, X. Y., Moodie, I. R., ... & Connallon, T. (2026). A century of theories of balancing selection. Biological Reviews, 101(2), 804-825.

Urban, L., Santure, A. W., Uddstrom, L., Digby, A., Vercoe, D., Eason, D., ... & Morales, H. E. (2024). The genetic basis of the kākāpō structural color polymorphism suggests balancing selection by an extinct apex predator. PLoS biology, 22(9), e3002755.

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Hear all about this one of a kind bird! I can't wait for you to see "hoatzin" store!

A big thank you to @theweenuthatch (instagram) for his insight and resources for this topic! Check him out for bird guiding services!

Follow me on instagram: @matt.rossella

Support the show: patreon.com/blurbs439

References:

Abourachid, A., Herrel, A., Decamps, T., Pages, F., Fabre, A. C., Van Hoorebeke, L., ... & Garcia Amado, M. A. (2019). Hoatzin nestling locomotion: acquisition of quadrupedal limb coordination in birds. Science advances, 5(5), eaat0787.

Buitrón-Jurado, G. (2014). An aberrant record of Hoatzin Opisthocomus hoazin (Statius Muller, 1976)(Aves: Opisthocomidae) in Venezuela. Check List, 10(1), 153-155.

Cracraft, J. (2022). The Hoatzin. Current Biology, 32(20), R1068-R1069.

Mayr, G. (2014). A hoatzin fossil from the middle Miocene of Kenya documents the past occurrence of modern-type Opisthocomiformes in Africa. The Auk: Ornithological Advances, 131(1), 55-60.

Mayr, G., Alvarenga, H., & Mourer-Chauviré, C. (2011). Out of Africa: Fossils shed light on the origin of the hoatzin, an iconic Neotropic bird. Naturwissenschaften, 98(11), 961.

Mayr, G., & De Pietri, V. L. (2014). Earliest and first Northern Hemispheric hoatzin fossils substantiate Old World origin of a “Neotropic endemic”. Naturwissenschaften, 101(2), 143-148.

Pagès, F. (2019). Compared and functional morphology of the hoatzin (Opisthocomus hoazin) (Doctoral dissertation, Museum national d'histoire naturelle-MNHN PARIS).

Other resources:

The Cornell Lab of Ornithology: Handbook of Bird Biology, 3rd edition.

The Science of Birds podcast episodes:

• Bird Bones: The Avian Skeleton
• The Avian Digestive System
• How Birds Fly

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The largest eagle ever known - hear all about this extinct apex predator!

Reach out to me on instagram: matt.rossella

Support the show (a.k.a become an endemic blurb!): patreon.com/blurbs439

References:

Brathwaite, D. H. (1992). Notes on the weight, flying ability, habitat, and prey of Haast’s Eagle (Harpagornis moorei). Notornis, 39(4), 239-247.

Bunce, M., Szulkin, M., Lerner, H. R. L., Barnes, I., Shapiro, B., Cooper, A., & Holdaway, R. N. (2005). Ancient DNA provides new insights into the evolutionary history of New Zealand's extinct giant eagle. PLoS biology, 3(1), e9.

Holdaway, R. N. (2021). Two new radiocarbon ages for Haast’s eagle (Hieraaetus moorei)(Aves: Accipitridae) and comments on the eagle’s past distribution and possible survival into the 19th century. Notornis, 68(4), 278.

Holdaway, R. N. (2025). The genus name for the extinct New Zealand Eagle (Accipitridae) and a suggested replacement for an inappropriate vernacular name. Bulletin of the British Ornithologists’ Club, 145(4), 406-410.

Knapp, M., Thomas, J. E., Haile, J., Prost, S., Ho, S. Y., Dussex, N., ... & Scofield, R. P. (2019). Mitogenomic evidence of close relationships between New Zealand’s extinct giant raptors and small-sized Australian sister-taxa. Molecular Phylogenetics and Evolution, 134, 122-128.

Scofield, R. P., & Ashwell, K. W. (2009). Rapid somatic expansion causes the brain to lag behind: the case of the brain and behavior of New Zealand's Haast's Eagle (Harpagornis moorei). Journal of Vertebrate Paleontology, 29(3), 637-649.

Van Heteren, A. H., Wroe, S., Tsang, L. R., Mitchell, D. R., Ross, P., Ledogar, J. A., ... & Sansalone, G. (2021). New Zealand's extinct giant raptor (Hieraaetus moorei) killed like an eagle, ate like a condor. Proceedings of the Royal Society B: Biological Sciences, 288(1964).

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Can you do me a small favour real quick? Have a listen to this episode! I hope you enjoy!

Follow me on instagram: matt.rossella

Want to help my work? click the support the show link at the bottom!

References:

Benítez-López, A., Santini, L., Gallego-Zamorano, J., Milá, B., Walkden, P., Huijbregts, M. A., & Tobias, J. A. (2021). The island rule explains consistent patterns of body size evolution in terrestrial vertebrates. Nature Ecology & Evolution, 5(6), 768-786.

Lomolino, M. V. (2005). Body size evolution in insular vertebrates: generality of the island rule. Journal of biogeography, 32(10), 1683-1699.

Matthews, T. J. (2023). Evolution: The rise and fall of island dwarfs and giants. Current Biology, 33(12), R684-R686.

Meiri, S., Raia, P., & Phillimore, A. B. (2011). Slaying dragons: limited evidence for unusual body size evolution on islands. Journal of Biogeography, 38(1), 89-100.

Ponti, R., Doutrelant, C., & Covas, R. (2023). Strength of the ‘island rule’ in birds is positively associated with absence of avian predators. Biology Letters, 19(3), 20220536.

Thomson, V. A., Mitchell, K. J., Eberhard, R., Dortch, J., Austin, J. J., & Cooper, A. (2018). Genetic diversity and drivers of dwarfism in extinct island emu populations. Biology Letters, 14(4), 20170617.

Wei, C., Peng, L., Zhang, Y., Nishiumi, I., Carey, G. J., Liu, Z., ... & Liu, Y. (2024). Integrative taxonomy of an East Asian songbird indicates rapid dwarfism after island colonization. Zoologica Scripta, 53(5), 509-522.

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Thankyou to Sam Holt for suggesting this topic! Follow them on instagram @samholtnz56 for excellent photography of New Zealand's landscapes and birds!

If you'd like to suggest a topic, then consider becoming a patron!: patreon.com/blurbs439

References:

Alley, M. R., Suepaul, R. B., McKinlay, B., Young, M. J., Wang, J., Morgan, K. J., ... & Gartrell, B. D. (2017). Diphtheritic stomatitis in yellow-eyed penguins (Megadyptes antipodes) in New Zealand. The Journal of Wildlife Diseases, 53(1), 102-110.

Bergen, D. J., & Gartrell, B. D. (2010). Discospondylitis in a yellow-eyed penguin (Megadyptes antipodes). Journal of Avian Medicine and Surgery, 24(1), 58-63.

Darby, J. T., Seddon, P. J., & Davis, L. S. (1990). Breeding biology of yellow-eyed penguins (Megadyptes antipodes). Penguin biology, 45-62.

French, R. K., Muller, C. G., Chilvers, B. L., & Battley, P. F. (2019). Behavioural consequences of human disturbance on subantarctic Yellow-eyed Penguins Megadyptes antipodes. Bird Conservation International, 29(2), 277-290.

Johnson, K. L. (2023). Marine predation injuries in yellow-eyed penguins (Megadyptes antipodes): a thesis presented in partial fulfilment of the requirements for the degree of Master of Veterinary Science in Wildlife Health at Massey University, Manawatū, New Zealand (Doctoral dissertation, Massey University).

Moore, P. J. (2001). Historical records of yellow-eyed penguin (Megadyptes antipodes) in southern New Zealand. Notornis, 48(3), 145-156.

Muller, C. G., Chilvers, B. L., & French, R. K. (2020). Population estimate for yellow-eyed penguins (Megadyptes antipodes) in the. Notornis, 67(1), 299-319.

Muller, C. G., Chilvers, B. L., Chiaradia, A., French, R. K., Kato, A., Ropert-Coudert, Y., & Battley, P. F. (2021). Foraging areas and plasticity of yellow-eyed penguins Megadyptes antipodes in their subantarctic range. Marine Ecology Progress Series, 679, 149-162.

Website used for research:

https://www.nzbirdsonline.org.nz/species/yellow-eyed-penguin

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Hear all about a little bird that has earned the big title of "GREAT SPECIATOR"!🥈

Connect with me on instagram: matt.rossella

References:

Estandía, A., Merino Recalde, N., Sendell‐Price, A. T., Potvin, D. A., Goulding, W., Robertson, B. C., & Clegg, S. (2025). Islands Promote Diversification of the Silvereye Species Complex: A Phylogenomic Analysis of a Great Speciator. Molecular ecology, e17830.

Estoup, A., & Clegg, S. M. (2003). Bayesian inferences on the recent island colonization history by the bird Zosterops lateralis lateralis. Molecular Ecology, 12(3), 657-674.

Scott, T., Scholer, M., Melville, D. S., & Underhill, L. G. (2023). Timing and duration of primary moult in New Zealand’s silvereye (tauhou, Zosterops lateralis). Notornis, 70, 97-110.

Sendell-Price, A. T., Ruegg, K. C., Anderson, E. C., Quilodrán, C. S., Van Doren, B. M., Underwood, V. L., ... & Clegg, S. M. (2020). The genomic landscape of divergence across the speciation continuum in island-colonising silvereyes (Zosterops lateralis). G3: Genes, Genomes, Genetics, 10(9), 3147-3163.

Books used for research:

Birdstories - Geoff Norman

Bird New Zealand (Beauty Like No Other) - Paul Gibson

The Brilliance of Birds (a New Zealand Birdventure) - Skye Wishart & Edin Whitehead

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You "mast" listen to this episode!

Follow me on instagram: matt.rossella

Support the show: patreon.com/blurbs439

References:

Bogdziewicz, M., Zwolak, R., & Crone, E. E. (2016). How do vertebrates respond to mast seeding?. Oikos, 125(3), 300-307.

Elliott, G., & Kemp, J. (2016). Large‐scale pest control in New Zealand beech forests. Ecological Management & Restoration, 17(3), 200-209.

Kelly, D., Koenig, W. D., & Liebhold, A. M. (2008). An intercontinental comparison of the dynamic behavior of mast seeding communities. Population Ecology, 50(4), 329-342.

O'Donnell, C. F., & Hoare, J. M. (2012). Quantifying the benefits of long-term integrated pest control for forest bird populations in a New Zealand temperate rainforest. New Zealand Journal of Ecology, 131-140.

Pearse, I. S., Wion, A. P., Gonzalez, A. D., & Pesendorfer, M. B. (2021). Understanding mast seeding for conservation and land management. Philosophical Transactions of the Royal Society B, 376(1839), 20200383.

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Come and hear about the only entire bird family to go extinct in recent times...

Footage of the last Kauaʻi ʻōʻō :

https://youtu.be/x2KH5AoyeBc?si=rEONFaoyUNL6Cpsm

References:

Fleischer, R. C., Campana, M. G., & James, H. F. (2022). Hawaiian songbird radiations. Current Biology, 32(20), R1070-R1072.

Fleischer, R. C., James, H. F., & Olson, S. L. (2008). Convergent evolution of Hawaiian and Australo-Pacific honeyeaters from distant songbird ancestors. Current Biology, 18(24), 1927-1931.

Lovette, I. J. (2008). Convergent evolution: raising a family from the dead. Current Biology, 18(24), R1132-R1134.

Pender, R. J., Morden, C. W., & Paull, R. E. (2014). Investigating the pollination syndrome of the Hawaiian lobeliad genus Clermontia (Campanulaceae) using floral nectar traits. American journal of botany, 101(1), 201-205.

Schmitt, C. J., & Edwards, S. V. (2022). Passerine birds. Current Biology, 32(20), R1149-R1154.

Zhao, M., Kimball, R. T., & Braun, E. L. (2025). The phylogenetic position of the extinct Hawaiian honeyeaters: Overcoming the limitations of antique DNA. bioRxiv, 2025-06.

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