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Organism

  Animalia

      Chordata

            Aves

              Avialae

                    Strigiformes

                      Strigi

                            Strigidae

                                     Asio

                                             Asio flammeus

                                             Asio otus

                                             Asio stygius

                              Asioninae

                                     Pseudoscops

                                             Pseudoscops clamator

                                             Pseudoscops grammicus

                                     Gymnoglaux

                                             Gymnoglaux lawrencii

                                     Micrathene

                                             Micrathene whitneyi

                                     Ninox

                                             Ninox scutulata

                                     Otus

                                             Otus flammeolus

                                             Otus sunia

                                     Speotyto

                                             Speotyto cunicularia

                              Striginae

                                     Ciccaba

                                             Ciccaba nigrolineata

                                             Ciccaba virgata

                                     Lophostrix

                                             Lophostrix cristata

                                               Lophostrix cristata stricklandi

                                     Megascops

                                             Megascops asio

                                             Megascops barbarus

                                             Megascops centralis

                                             Megascops choliba

                                                   [Otus choliba]

                                               Megascops choliba luctisonus

                                             Megascops clarkii

                                                   [Otus clarkii]

                                             Megascops cooperi

                                             Megascops guatemalae

                                                   [Otus guatemalae]

                                             Megascops kennicottii

                                             Megascops nudipes

                                             Megascops seductus

                                             Megascops trichopsis

                                                   [Otus trichopsis]

                                     Pulsatrix

                                             Pulsatrix perspicillata

                                     Strix

                                             Strix fulvescens

                                             Strix nebulosa

                                             Strix occidentalis

                                             Strix varia

                                     Surnia

                                             Surnia ulula

                              Surniinae

                                     Aegolius

                                             Aegolius acadicus

                                             Aegolius funereus

                                             Aegolius ridgwayi

                                     Athene

                                             Athene cunicularia

                                     Glaucidium

                                             Glaucidium brasilianum

                                             Glaucidium costaricanum

                                             Glaucidium gnoma

                                             Glaucidium griseiceps

                                             Glaucidium jardinii

                                             Glaucidium minutissimum

                                             Glaucidium palmarum

                                             Glaucidium sanchezi

                                             Glaucidium siju