Facts about Dusky Dolphin
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Named Lagenorhynchus obscurus by John Edward Gray in 1828, the dusky dolphin belongs to the family Delphinidae and is closely related to the Pacific white-sided dolphin.
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Dusky dolphins possess a distinctive bipartite coloration pattern with darker gray dorsal surfaces and lighter ventral regions, creating a striking two-toned appearance unique among Southern Hemisphere cetaceans.
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Dusky dolphins inhabit exclusively Southern Hemisphere waters, with populations distributed along the coasts of South America, southern Africa, Australia, and New Zealand between latitudes 32 and 56 degrees south.
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The dusky dolphin's diet consists primarily of lanternfish and anchovies, with stomach analyses from specimens off Peru revealing these deep-diving prey comprise over 80 percent of their consumed biomass.
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A newborn dusky dolphin weighs approximately 10 kilograms at birth and reaches sexual maturity between 7 and 10 years of age in Southern Hemisphere populations.
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Dusky dolphins produce distinctive clicks and whistles at frequencies up to 130 kilohertz for echolocation and social communication in murky coastal waters.
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Groups of dusky dolphins typically contain 6 to 12 individuals, though aggregations can reach several hundred during feeding frenzies off New Zealand and South America.
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Acrobatic leaps up to 6 meters high characterize dusky dolphins during their social interactions and hunting behaviors in the Southern Ocean.
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Speeds of up to 34 kilometers per hour make dusky dolphins among the fastest cetaceans in coastal waters worldwide.