Weddell Seal
These deep divers can hold their breath for up to an hour
What you need to know about the Weddell Seal
Our Expert Says… "We quite often see Weddell seals hauled-out on land when we make Zodiac landings, and they are very relaxed about our presence. We do keep our distance, but they are very happy to share their beaches with us. Male Weddell seals don't live as long as the females because their teeth wear out more quickly thanks to constantly scraping the ice to keep their winter breathing holes clear, reducing their ability to hunt and eat."
Weddell Seals are one of the largest of the Antarctic seal species, and also one of the most numerous, with a population thought to be over a million strong.
The Weddell Seal was first discovered and named in the 1820s by a British sealer called James Weddell, who was exploring the area of the Southern Ocean that’s now known as the Weddell Sea. Unfortunately, their discovery and abundance led to an explosion of commercial sealing in the region that caused a huge drop in their numbers.
However, since the ending of commercial hunting, the Weddell Seal has recovered well and is now the second-most numerous Antarctic seal after the crabeater seal. Nevertheless, as a seal that prefers to breed and gather on ice, the impact of global warming on their habitats and breeding success is being closely monitored.
Weddell Seal can grow up to about 3.3m (11ft) long and weigh as much as 590kg (1,300lb). Unlike some species, the males actually weigh less than the females and are about the same length. When hauled out, Weddell Seals most often lie on their sides rather than their bellies, and in winter they stay in the water to avoid freezing blizzards, staying close to breathing holes in the ice that they work to keep open.
Breeding season for Weddell seals begins in early September with the birth of pups, and last until the end of November when females have mated again and the new pups are weaned. Mating only occurs underwater, and so is not usually seen.
Weddell seals are excellent divers, and scientists have recorded them diving as deep as 2,000ft for up to an hour at a time! They mainly hunt for Antarctic cod, but will also take squid, prawns, and other bottom-feeding crustaceans. Although not thought to be a major part of their diet, Weddell seals have been seen hunting and killing penguins, although it’s not known how common this is.
Like many Antarctic species, the longer-term effects of climate change on the Weddell Seal population is unknown. However, as a species that relies on the presence of ice for breeding and for winter habitat, the effects of reducing polar ice coverage is clearly a concern.