Edna Fisher, _Jour. Mammalogy_, Vol. 20, p. 21 (sea otter). P.
A. Gilbert, 1939, _Emu_, Vol. 39, pp. 18-22 (satin bower bird).
D. Lack, 1947, _Darwin's Finches_, p. 59 (woodpecker finch). D.
Morris, 1954, _British Birds_, Vol. 47, p. 33 (song thrush). A. C.
Bent, 1921, _U. S. Natl. Mus. Bull._ 113, p. 111 (gull and crow).