Abstract
A wild pheasant (Phasianus colchicus, ♀, 720 grams) was tracked by radio-telemetry at Karuizawa, Nagano Prefecture for seven days in late July and early August 1968. A transmitter (34.6 grams including antenna and battery) was attached to the pheasant with a harness (2.9 grama) made of vinyl-coated cloth. The total weight of the attached instruments was 5.2 percent of the weight of the bird. The direction of the pheasant was measured at three points every 30 minutes from sunrise to sunset during the period, and the location was plotted on the map as the centre of gravity of the triangle constructed by three direction lines from the messured points. The moving range of the bird changed every day, from 160 to 450m in diameter. The total range of the seven days was 870×280m. The location of the roost also changed every night, but it was always under a shrub in the open field. The bird was observed to fly only three times in the period when driven out by a man, a dog, and a cat. It can be guessed that the pheasants hardly fly in an undisturbed condition.
