The family Pachycephalidae includes the whistlers, shrike-thrushes, shrike-tits, pitohuis and crested bellbird. It is rhythmically done with drums and other instruments including whistlers and conches. The family Pachycephalidae includes the whistlers, shrike-thrushes, shrike-tits, pitohuis, and crested bellbird. One of the most well known whistling competitions is the International Whistlers Convention (IWC). Rufous whistlers are large-headed and stocky. The family Pachycephalidae includes the whistlers and shrike-thrushes. The family Pachycephalidae includes the whistlers, shrike-thrushes, shrike-tits, and pitohuis. Measurements of whistlers are employed to infer the physical properties of the magnetosphere. Precipitation runoff from The Whistlers drains into tributaries of the Athabasca River. The breeding season for rufous whistlers is between the months of July and February. It is 7 kilometres south of Jasper, off the Icefields Parkway on Whistlers Road. In 1953, Storey showed that whistlers originate from lightning discharges. The range of pucker whistlers varies from about one to three octaves. This is the origin of the name "whistlers". A relationship has also been suggested with the whistlers (Pachycephalidae).