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While birds are the best-known animals with this fused bone, they were not the only group and not even the first to have it: in a remarkable case of parallel evolution, a tarsometatarsus was also present in the Heterodontosauridae, a group of tiny ornithopod dinosaurs quite unrelated to birds.
Ferrás Sexto completed his PhD under the supervision of Patrick O'Flanagan, conducting a comparative study on the parallel evolution and rural change between Ireland and Galicia.