Sentence:  Out-of-state birders seeking Ruddy Ground Doves should be aware of two things. <WSD>Ruddies</WSD> associate much more frequently with Inca Doves than with Common Ground Doves. In fact, in eleven personal sightings of this species in Arizona, I have never seen a <WSD>Ruddy</WSD> with a Common nor has anyone else I know. [...] Perhaps this is a slow invasion, and forty years hence <WSD>Ruddies</WSD> will be so common ... 
Meaning of the word marked with <WSD> tags:  A ruddy ground dove.