Are Bird Feeders Driving Evolution Of Longer Beaks In British Tits?

Great tit (Parus major) on a garden bird feeder.
(Credit:
Dennis van de Water)
Fig. 1. Population structure of Western European great tits. (A) Worldwide distribution of P. major and sampling locations in Wytham (gray triangle), Oosterhout (yellow square), and Veluwe (green circle). (B) Principal component analysis of genotype data. © ADMIXTURE plot with K = 3, which is both the most likely number of clusters and the number of geographically distinct sampling sites. Levels of genetic structure are low.
(doi:
10.1126/science.aal3298)
Hawaiian honeycreepers. Look at those beaks!
(Credit: H. Douglas Pratt.)

Source:

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𝐆𝐫𝐫𝐥𝐒𝐜𝐢𝐞𝐧𝐭𝐢𝐬𝐭, scientist & writer

𝐆𝐫𝐫𝐥𝐒𝐜𝐢𝐞𝐧𝐭𝐢𝐬𝐭, scientist & writer

PhD evolutionary ecology/ornithology. Psittacophile. scicomm Forbes, previously Guardian. always Ravenclaw. discarded scientist & writer, now an angry house elf