A robin is a robin is a robin

Speranza

From the OED below.
Cheers.

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3. Chiefly N. Amer. A large, migratory thrush, Turdus migratorius (family Turdidae), which has brick red underparts and a dark head, widespread and common in North America. Also more fully American robin. Also (with distinguishing word): any of several similar American thrushes.Earlier in robin redbreast (see robin redbreast n. 2a).
1703 S. Sewall Diary 16 Mar. (1973) I. 483 The Robbins cheerfully utter their Notes this morn.
1750 J. Birket Voy. N. Amer. (1916) 13 They have‥a bird like our field fare with a red brest which they call a Robin that sings delightfully.
1808 A. Wilson Amer. Ornithol. I. 37 The Robin is one of our earliest songsters.
1858 H. W. Longfellow Miles Standish iii. 3 Into the tranquil woods, where blue-birds and robins were building.
1888 G. H. Kingsley in Field 16 June 869/2 In America I shoot robins and find them thrushes.
1931 Times Lit. Suppl. 5 Nov. 859/3 A lovely little bird hardly as large as an American robin.
1966 Vancouver Province 19 Nov. 1/5 The robin had been sitting in a mountain ash tree in his front yard.
1987 Field Guide Birds N. Amer. (National Geographic Soc.) (ed. 2) 330 Rufous-backed Robin. Turdus rufopalliatus.‥ Clay-colored Robin. Turdus grayi.
1992 J. Osborne Cardinal i. 19 Some songbirds occasionally sing from the ground. The American Robin is one of these.
1703—1992(Hide quotations)


4.
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a. Chiefly N. Amer. Any of various unrelated songbirds that resemble the European or American robin, esp. in having reddish or orange colour on the breast or underside. Usu. with distinguishing word.blue, golden, ground, Pekin, swamp robin, etc.: see the first element.
1769 R. Smith Jrnl. 18 May in Tour Four Great Rivers (1906) 41 The lively Note of the Swamp Robin, the Red Bird and other Birds from the earliest Dawn is entertaining.
1794 Philos. Soc. Trans. 4 110 This bird was the chewink, or ground robin.
1855 Orr's Circle Sci., Org. Nat. III. 265 One of the commonest species, the Baltimore Oriole,‥has received the name of fire-bird.‥ It is also called the Golden Robin.
1884 Harper's Mag. Mar. 610/1 Our New England forefathers call him the ‘blue robin’.
1905 Newark (Ohio) Advocate 2 June 4/3 The Japanese nightingale, or Pekin robin, is becoming naturalized in the parks of London.
1955 Sci. News Let. 23 Apr. 271 The towhee is a bird of many aliases. ‘Ground robin’ is a popular name, and justified by his deceptively robin-like appearance.
2004 T. Wheeler Falklands & S. Georgia 62 It's easy to see why the meadowlark, with its bright red breast, is known locally as the ‘robin’ or ‘military starling’.