<P> An individual howl lasts an average of 3 seconds, but can last as long as 5 seconds . At the start, the frequency rises and stabilizes for the rest of the howling, but normally shows abrupt changes in frequency . Modulations can change quickly every 300--500 milliseconds or every second . Five to eight overtones can generally be distinguished in a spectrographic analysis of the howling . Sonograms show that their howl can be compared to the song of a humpback whale . </P> <P> New Guinea singing dogs sometimes howl together which is commonly referred to as chorus howling . During chorus howling, one dog starts and others join in shortly afterward . In most cases, chorus howling is well synchronized, and the howls of the group end nearly simultaneously . Spontaneous howling is most common during the morning and evening hours . A trill, with a distinctly "bird - like" character, is emitted during high arousal . It is a high - frequency pulsed signal whose spectral appearance suggests a continuous source that is periodically interrupted, and might last as long as 800 milliseconds . Such a sound is not known for any other canid; however, a similar sound (with lower frequency) has been described for a dhole at the Moscow Zoo . When they are kept with dogs that bark, singers may mimic the other dogs . </P> <P> Like other dingo types, female singers come into heat once a year rather than twice a year normally associated with domestic breeds . Their breeding season generally starts in August and ends during December . Gestation averages 63 days . In Tierpark Berlin, 80% of the litters were born in October and November and the gestation period was 58 to 64 days . The litter size was 1 to 6 pups . Reports of 25 female singers in captivity showed that when they did not conceive during their first annual estrus, about 65% have a second estrus cycle, sometimes even a third, 8--16 weeks later . </P> <P> Males in captivity often participate in raising the pups, including the regurgitation of food . Female singers are protective of their young and will aggressively attack their male counterpart if they feel he poses a danger to the puppies . During the first breeding season following their birth, especially if there is a potential mate present, pups are often aggressively attacked by the same - sex parent . </P>

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