Note 41 — Chapter XVI · EXPERIENCES WITH EAGLES.

This transformation of colour is well represented (though not designedly so) by the two plates at p. 88 of Dr. Bree's "Birds of Europe" (2nd ed.). The "Tawny Eagle" there figured might be a young Imperial of, say, two months old; while Aquila culleni, so far as colour is concerned, would do duty for the same bird at two years.