Polioptila caerulea (blue-grey gnatcatcher) | CLASSIFICATION

Kingdom Animalia (animals)
- Eumetazoa (metazoans)
  - Bilateria (bilaterally symmetrical animals)
    - Deuterostomia (deuterostomes)
      - Phylum Chordata (chordates)
        
        Craniata (craniates)
        
        Subphylum Vertebrata (vertebrates)
        
        Superclass Gnathostomata (jawed vertebrates)
        
        Euteleostomi (bony vertebrates)
        
        Class Sarcopterygii (lobe-finned fishes and terrestrial vertebrates)
        
        Tetrapoda (tetrapods)
        
        Amniota (amniotes)
        
        Class Reptilia (turtles, snakes, lizards, and relatives)
        
        Class Aves (birds)
        
        Subclass Neognathae (neognath birds)
        
        Infraclass Neoaves (modern birds)
        
        Order Passeriformes (perching birds)
        
        Passerida
        
        Muscicapoidea (thrushes, sparrows, and relatives)
        
        Family Polioptilidae (gnatcatchers)
        
        Genus Polioptila (gnatcatchers)
        
        Species Polioptila caerulea (blue-grey gnatcatcher)
        
        Subspecies Polioptila caerulea caerulea
        
        Subspecies Polioptila caerulea caesiogaster
        
        Subspecies Polioptila caerulea cozumelae
        
        Subspecies Polioptila caerulea deppei
        
        Subspecies Polioptila caerulea nelsoni
        
        Subspecies Polioptila caerulea obscura
        
        Subspecies Polioptila caerulea perplexa