Heaviside's Dolphin (Cephalorhynchus heavisidii) lives in temperate coastal waters across Southern African coast. Its conservation status is Near Threatened.
Fascinating facts about the Heaviside's Dolphin
- Heaviside's dolphins grow to a maximum length of 1.7 m (5.6 ft) and weigh up to 75 kg (165 lb). Their stocky, cone-shaped head and triangular dorsal fin give them a distinctive black-grey-white pattern that is not easily confused with any other species in their range.
- These dolphins travel only short distances each day, maintaining home ranges of just 50-80 km (31-50 mi) as shown by satellite telemetry over 2-3 months and photographic resightings up to three years. Some individuals have been spotted at the same spot for a decade, highlighting extreme site fidelity. Such limited movement makes them especially vulnerable to localized threats like by-catch or boat traffic, because a single impact can affect a large proportion of a resident population.
- When hunting, Heaviside's dolphins use narrow-band high-frequency echolocation clicks centered around 125-130 kHz, a frequency range that is largely inaudible to their main predator, the killer whale. This acoustic stealth likely reduces predation risk, while the high-resolution clicks give them a foraging edge in the cluttered near-shore environment where juvenile hake and octopus hide among the seabed.
- Group sizes are usually tiny, most sightings involve 2-3 individuals, though occasional aggregations of up to 100 dolphins have been recorded in high-density bays. Unlike many dolphin species, they never form nursery groups of only mothers and calves.
- Population estimates are sparse, but a focused survey between Table Bay and Lamberts Bay counted 6,345 individuals, while nearby Walvis Bay and Lüderitz host 508 and 494 dolphins respectively. In the Namibian Islands' Marine Protected Area, an average of 1,594 dolphins were recorded along 400 km (250 mi) of coastline.
Sources
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At a glance
RangeSouthern African coast
HabitatTemperate coastal waters
DietFish and squid
About the Heaviside's Dolphin
In the turbulent waters off the coast of southern Africa, the Heaviside's dolphin dances with effortless agility, its sleek, slate-grey form weaving through the waves with a mesmerizing fluidity. As it moves, its dorsal fin slices through the surface, leaving behind a trail of glittering, sun-kissed droplets that shimmer like a thousand tiny diamonds. With its playful, inquisitive nature and remarkable ability to thrive in the harsh, windswept seas, this enchanting creature has captivated the hearts of all who are fortunate enough to encounter it.
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