They are robust, seed-eating birds with strong bills. The family ranges in size from the 12-cm (4.7-in), 11.5-g (0.40-oz) and up orange-breasted bunting to the 25-cm (9.8-in), 85-g (2.99-oz) black-headed saltator. They are typically associated with open woodland. The sexes usually have distinctive appearances.
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To be eligible, patients could not be addicted to any drugs other than heroin, caffeine, or nicotine. After initial heroin detoxification, the investigators randomly assigned participants to receive low-dose depot naltrexone, high-dose depot naltrexone, or placebo at the beginning of weeks 1 and 5.