Hoatsiin, Opisthocomus hoazin

Hoatsiin on ürgne lind, ainus elusolev liik oma sugukonnast. Ürgsuse üheks näiteks on tibudel tiibade küljes asuvad küünised, mida saab seostada dinosaurustega ning mida noored linnud kasutavad puude otsas ronimiseks, et kiskjad neid kohe nahka ei paneks. Nimelt kukutavad nad end ründe korral vette ning kui oht möödas, roninvad tibud küüniseid kasutades puu otsa tagasi. Arvatakse, et tegemist on atavismiga ehk siis olukorraga, kus need küünised on vahepeal kadunud olnud, kuid kuna olukord nõudis, siis on need taas geenidest üles leitud ja taastekkinud. Foto sellest efektsest linnust sai tehtud Ecuadori Amazonias, Cuyabeno loodukaitsealal.

Hoatzin is a primeval bird, the only extant species in its genus. One of the examples of the primevalness is that hoatzin chicks have claws on the wings which come from the era of the dinosaurs and what young birds use to get out of trouble. Meaning that if someone attacks them, the chicks drop into water and after the danger has passed climb back to trees using the claws. It is thought that the claws are atavism which means that these have been gone at some point but have reappeared as the data of such possibilities was still stored in the genome. The photo of this showy bird was taken in Ecuadorian Amazon, in Cuyabeno Wildlife Reserve.