in 1966, the pygmy blue whale differs from the "true" blue whales in a number of physical characteristics. It has:
*broader and shorter baleen plates
*a shorter tail, and hence a proportionately longer body in front of the dorsal fin
*a larger head relative to body size
*a heavier body weight compared to other blue whales of the same length

Pygmy blue whales reach sexual maturity at 10 years of age and a length of 19.2 meters, weighing on average 52.5 tonnes. As adults, males average 21.1 meters and females 21.9 meters,