The Barred Owl (L)
(Strix varia) is closely related to the Spotted Owl (R)
(Strix occidentalis) and tends to be more aggressive than its smaller, spotted cousin. As a result, where populations meet, it is usually the Barred Owl that retains the majority of territories.
The Barred Owl (L)has vertical barring on its belly (horizontal on the breast) while its western cousin the Spotted (R) has horizontal barring (which often appears blotchy or spotted) on its belly and tends to be a darker brown overall.
Where populations overlap, these two species will interbreed.
Progeny from these mating's are known as Sparred Owls.
You can read more about this hybrid Sparred owl by clicking on the link HERE