A coloured sketch of a bird's spread wing from above, from Wikimedia Commons (Erfil after Muriel Gottrop): nine feather tracts in Latin – the primaries, secondaries and tertials, the alula, the greater primary coverts, the greater, median and lesser coverts, and the scapulars. The Latin chips show…
A real anatomical diagram. Hover any part to see its name, click to answer the quiz question.