Blue Rock Thrush
Monticola solitarius
The blue rock thrush is a starling-sized bird, 21–23 cm (8.3–9.1 in) in length with a long slim bill. The breeding male of the nominate subspecies is unmistakable, with all blue-grey plumage apart from its darker wings. Females and immatures are much less striking, with dark brown upperparts, and paler brown scaly underparts. The male of the subspecies M. s. philippensis has rufous-chestnut plumage from the mid-breast down to the undertail. Both sexes lack the reddish outer tail feathers of rock thrush. Monticola is a monophyletic clade as all member species share a common ancestor. M. Voice: The male blue rock thrush sings a clear, melodious call that is similar to, but louder than, the call of the rock thrush. The Europe and Asia groups both have a "short song and a long song, consisting of similar melodious whistles, trills and more burry notes." Generally, the vocalizations are similar in both groups.
ID text from Wikipedia, CC BY-SA 4.0
Common Rock Thrush
Monticola saxatilis
This is a medium-sized but stocky thrush 17–20 cm in length. The summer male is unmistakable, with a blue-grey head, orange underparts and outer tail feathers, dark brown wings and white back. Females and immatures are much less striking, with dark brown scaly upperparts, and paler brown scaly underparts. The outer tail feathers are reddish, like the male.
ID text from Wikipedia, CC BY-SA 4.0
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