The red-flanked bluetail, also known as the orange-flanked bush-robin, is a small passerine bird that was formerly classed as a member of the thrush family Turdidae, but is now more generally considered to be an Old World flycatcher, Muscicapidae.
The arrival of the redwing is a sure sign that winter is on its way. As the UK's smallest true thrush, its creamy strip above the eye and orange-red flank patches make it very distinctive. They roam across the UK's countryside, feeding in fields and hedgerows, rarely visiting gardens, except in the coldest weather when snow covers the fields.
FEMALE Mountain Bluebird is a medium-sized bird with a length from 6.3–7.9 in. They have light underbellies and black eyes. Adult males have thin bills that are bright turquoise-blue and somewhat lighter beneath. Adult females have duller blue wings and tail, grey breast, grey crown, throat and back. In fresh fall plumage, the female's throat and breast are tinged with red-orange; brownish near the flank contrasting with white tail underparts -Wikipedia.