Other largish "Aquila" species, the eastern imperial eagle ("A. heliaca"), the Spanish imperial eagle ("A. adaberti"), the tawny eagle ("A. rapax") and the steppe eagles ("A. nipalensis"), are now thought to be separate, close-knit clade, which attained some characteristics similar to those of the prior clade via convergent evolution. Genetically, the "spotted eagles" ("C. pomarina, C. hasata & C. clanga"), have been discovered to be more closely related to the long-crested eagle ("Lophaetus occipitalis") and the black eagle, and have been transferred to the genus "Clanga". The genus "Hieraaetus", traditionally including the booted eagle ("H. pennatus"), little eagle ("H. morphnoides") and Ayres's hawk-eagle ("H. ayresii"), consists of much smaller species, that are in fact the smallest birds called eagles outside of the unrelated "Spilornis" serpent-eagle genus. This genus has recently been eliminated by many authorities and is now occasionally also included in "Aquila", although not all ornithological unions have followed this suit in this re-classification. The small-bodied Wahlberg's eagle ("H. wahlbergi") has been traditionally considered an "Aquila" species due to its lack of change from juvenile to adult plumage and brownish color but it is actually genetically aligned to the "Hieraaetus" lineage.