According to Hackett et al. (2008), loons, penguins, storks, and as well as Suliformes and Pelecaniformes, all seem to have evolved from a common ancestor.
Segundo Hackett et al. (2008), as mobellas, pingüíns, cegoñas, e tamén os Suliformes e Pelecaniformes, parece que evolucionaron todos dun antepasado común.