Hourglass Dolphin | Oceana
Home / Hourglass Dolphin

Marine Life Encyclopedia

Marine Mammals

Hourglass Dolphin

Lagenorhynchus cruciger

Distribution

Southern Ocean

ECOSYSTEM/HABITAT

Open Ocean (Pelagic)

FEEDING HABITS

Active Predator

TAXONOMY

Order Cetartiodactyla, Family Delphinidae (dolphins)

The hourglass dolphin’s body is short and stocky, while the dorsal fin is tall and curved, sometimes even appearing bent towards the body in adult males. Their body narrows near the mouth where one of the dolphin’s white patches begins, extending over the eye and tapering off at the dorsal fin. The dolphin’s second white patch begins where the other ends and narrows at the tail, creating the iconic hourglass illusion. The hourglass dolphin is the only small dolphin that swims south of the Antarctic convergence where cold Antarctic waters meet the slightly warmer waters of the sub-Antarctic. The largest concentrations of hourglass dolphins have been sighted in Drake Passage, which lies between the tip of South America and Antarctica.

Similar to other cetaceans, hourglass dolphins swim in groups called pods that can reach up to 100 individuals. However, the average hourglass pod is closer to 14 or less individuals. Swimming at speeds of up to 22 km/h, hourglass dolphins are notorious for riding the waves of fast boats and spraying the surface with sea water as they come up for air. Hourglass dolphins live on a diet of fish, squid and crustaceans and feed at the surface, which often draws a crowd of sea birds and helps research vessels spot the groups of dolphins. The reproductive habits of hourglass dolphins have not been observed, but relatives of this species, like the Pacific white-sided dolphin and the dusky dolphin, give birth every 28 months between August and October.

An estimated 144,300 hourglass dolphins remain south of the Antarctic convergence. There are no direct threats to this species, largely because their remote habitat is rarely visited by humans. However, climate change could still pose a threat to hourglass dolphins in the near future. Climate change has the potential to raise sea temperatures significantly, which could disrupt vital marine ecosystems that have adapted to the cold water.

Fun Facts About Hourglass Dolphins

1. Hourglass dolphins are named after the distinct, hourglass-shaped white markings on their sides.

2. Hourglass dolphins are known for bow riding (leaping through waves) in front of ships and whales.

3. Hourglass dolphins have been spotted in groups of up to 100, but typically stay in smaller groups of about 8 dolphins.

4. Hourglass dolphins reach a maximum known length of 6 feet (1.8 m).1

5. The hourglass dolphin is the only small dolphin species found in Antarctic waters.2

Engage Youth with Sailors for the Sea

Oceana joined forces with Sailors for the Sea, an ocean conservation organization dedicated to educating and engaging the world’s boating community. Sailors for the Sea developed the KELP (Kids Environmental Lesson Plans) program to create the next generation of ocean stewards. Click here or below to download hands-on marine science activities for kids.

Kids Environmental Lesson Plans

References:

1 United Nations Food and Agriculture Organization

2 IUCN Red List

Get Involved

Donate Today

SUPPORT OUR WORK TO PROTECT THE OCEANS BY GIVING TODAY

With the support of more than 1 million activists like you, we have already protected nearly 4 million square miles of ocean.

Donate Now

TAKE ACTION NOW

Support policy change for the oceans

Decision-makers need to hear from ocean lovers like you. Make your voice heard!

Sign Now

VISIT OUR ADOPTION CENTER

SYMBOLICALLY ADOPT AN ANIMAL TODAY

Visit our online store to see all the ocean animals you can symbolically adopt, either for yourself or as a gift for someone else.

Shop Today

DOWNLOAD OCEAN ACTIVITIES

HELP KIDS DISCOVER OUR BLUE PLANET

Our free KELP (Kids Environmental Lesson Plans) empower children to learn about and protect our oceans!

Learn More

FEATURED CAMPAIGN

Save the Oceans, Feed the World

We are restoring the world’s wild fish populations to serve as a sustainable source of protein for people.

Learn More

More CAMPAIGNs

Protect Habitat

Bycatch

Plastics

View All

CONTACT

Oceana International Headquarters
1025 Connecticut Avenue, Suite 200
Washington, DC 20036 USA

General Inquiries
+1(202)-833-3900
info@oceana.org

Donation Inquiries
+1(202)-996-7174
wavemaker@oceana.org

Press Inquiries
+1(202)-833-3900
press@oceana.org

OCEANA'S EFFICIENCY

BECOME A WAVEMAKER

Sign up today to get weekly updates and action alerts from Oceana.

SHOW YOUR SUPPORT WITH A DONATION

We have already protected nearly 4 million square miles of ocean and innumerable sea life - but there is still more to be done.

Donate Now

QUICK LINKS: