FEATHERS, homologous variation in.
FEET, of pigeons, individual differences of. -correlations of external characters in.
FEET and beak, correlation of, in pigeons.
FELIDAE, fertility of, in captivity.
Felis bubastes.
Felis caffra.
Felis caligulata.
Felis chaus.
Felis jubata.
Felis lybica.