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Sousa chinensis
Indo-Pacific Humpbacked Dolphin
Vulnerable
Also known as: Chinese White Dolphin +3 more
Sousa chinensis
Adults develop an extraordinary pinkish coloration as they age — born grey-brown, they gradually lighten to white or pink, with the final color varying by individual. The pink color comes from blood vessels near the surface of the skin (not from pigment), a thermoregulatory adaptation. Named for the hump found ahead of the dorsal fin in adults.
Well-developed echolocation and hearing suited to shallow, turbid estuarine waters. Vision is limited in murky river plume environments but echolocation compensates effectively.
Produces complex whistles and click trains. Studies in Hong Kong and China have documented signature whistles. Populations separated by as little as 60 miles show measurably different vocal characteristics.
Hunts cooperatively in shallow coastal waters, often exploiting fish aggregations around coral reefs, mangroves, and oyster beds. Has been documented following fishing vessels to take advantage of discarded bycatch.
Gestation
10–12 months. Females give birth every 3–4 years.
Birth
Calves are approximately 35–40 inches long and 30–40 lbs at birth. Born uniformly grey — the pink color develops gradually over 10+ years.
Calves
Calves nurse for 2+ years and remain closely associated with their mothers for 3–5 years. Mother-calf bonds in Hong Kong have been tracked for over 15 years in some cases.
Females reach sexual maturity at approximately 9–10 years; males at 12–13 years.
Found in small, loosely associated groups of 2–10. The Hong Kong population is organized into fluid fission-fusion societies — individuals travel between groups but maintain long-term preferred associations. Mother-calf pairs are the most stable social units.
Active swimmers capable of breach, spy-hop, and tail-slap behaviors. Not known for bow-riding. Can reach 12–15 mph.
The Indo-Pacific Humpbacked Dolphin is the official marine mammal of Hong Kong, appearing on souvenir items and playing a significant role in local conservation awareness. Despite this, the Pearl River population has declined by over 50% since 2002 due to port expansion, reclamation projects, and boat traffic.
40+ years. Threats include coastal development and reclamation, boat strike, gillnet bycatch, aquaculture entanglement, heavy vessel traffic (particularly around Hong Kong Airport reclamation), and marine pollution from the Pearl River.
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