Tetrao scoticus.
Tetrao tetrix, pugnacity of the male.
Tetrao umbellus, pairing of; battles of; drumming of the male.
Tetrao urogalloides, dances of.
Tetrao urogallus, pugnacity of the male.
Tetrao urophasianus, inflation of the oesophagus in the male.
Thamnobia, young of.
Thecla, sexual differences of colouring in species of.
Thecla rubi, protective colouring of.
Thecophora fovea.