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Northern Saw-whet Owl
Aegolius acadicus (Gmelin, JF, 1788)
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You can select up to 8 checklists to perform a comparison of taxonomic authorities for this taxon and related concepts:

You can also use one of the pre-defined group of taxonomic authorities below:

The table provided below compares authorities for this taxon and related concept. Names in red are those that differ from the name in the column located immediately to the left.
Species concept American Ornithologists' Union 1st edition (1886)American Ornithologists' Union 2nd edition (1895)American Ornithologists' Union 3rd edition (1910)American Ornithologists' Union 4th edition (1931)American Ornithologists' Union 5th edition (1957)American Ornithologists' Union 6th edition (1983)American Ornithologists' Union 7th edition (1998)American Ornithologists' Union 7th edition (incl. 59th suppl.)
Aegolius [acadicus or ridgwayi] Nyctala acadica
Saw-whet Owl
Nyctala acadica
Saw-whet Owl
Cryptoglaux acadica
Saw-whet Owl
Cryptoglaux acadica
Saw-whet Owl
Aegolius acadicus
Saw-whet Owl
 
 
 
 
 
 
* Aegolius acadicus  
 
 
 
 
 
 
 
 
 
Aegolius acadicus
Northern Saw-whet Owl
Aegolius acadicus
Northern Saw-whet Owl
Aegolius acadicus
Northern Saw-whet Owl
Aegolius acadicus acadicus  
 
 
 
 
 
Cryptoglaux acadica acadica
 
Aegolius acadicus acadicus
 
 
 
 
 
 
 
Aegolius acadicus acadicus (acadicus)  
 
 
 
Cryptoglaux acadica acadica
 
 
 
 
 
 
 
 
 
 
 
[Aegolius acadicus acadicus (brodkorbi)]  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
[Aegolius acadicus acadicus (scotaea)]  
 
 
 
Cryptoglaux acadica scotaea
 
 
 
 
 
 
 
 
 
 
 
Aegolius acadicus brooksi  
 
 
 
 
 
Cryptoglaux acadica brooksi
 
Aegolius acadicus brooksi
 
 
 
 
 
 
 
* Aegolius ridgwayi  
 
 
 
 
 
 
 
 
 
Aegolius ridgwayi
Unspotted Saw-whet Owl
Aegolius ridgwayi
Unspotted Saw-whet Owl
Aegolius ridgwayi
Unspotted Saw-whet Owl
Aegolius ridgwayi ridgwayi  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Aegolius ridgwayi tacanensis  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Aegolius ridgwayi rostratus  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

         

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