"Fig. 30., Feathers of a sparrow's wing. pc, covers of the primaries; msc, median upper secondary coverts; bc, tectrices minores; b, primaries; s, secondaries; t, tertiaries." Elliot Coues, 1884

Feathers of a Sparrow's Wing

"Fig. 30., Feathers of a sparrow's wing. pc, covers of the primaries; msc, median upper secondary coverts;…