Scientists discover previously unknown North Atlantic right whale calf
The calf, born to a 38-year-old mother, brings the season's total births to 24, the highest number since 2009.
Explainer
Scientists have identified a previously undocumented North Atlantic right whale calf, a major discovery for one of the world's most endangered marine mammals. Researchers in Canada photographed the unidentified baby whale off Anticosti Island in Quebec in September. Analysts at the New England Aquarium in Boston have now confirmed the calf was likely born months ago but evaded detection during winter surveys. The discovery brings the total number of newborn right whales from the latest birthing season to 24, marking the species' most productive year since 2009 and the fourth highest on record. The global population of North Atlantic right whales totals only around 380, having declined steadily since 2010.
The calf was seen swimming alongside its 38-year-old mother, a whale known to researchers as Silt. Right whales typically give birth off the southeastern U.S. coast in winter before traveling north to New England and Canada to feed. Amy Warren, a scientist at the New England Aquarium’s Anderson Cabot Center, described the finding as a welcome surprise. "Silt was briefly seen in the southeastern U.S. calving grounds in February 2026, so it’s possible she had the calf there but snuck away before they were documented together. This is an exciting discovery for us so late in the year," Warren said.
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Why is the discovery of a single calf significant?
Scientists closely monitor births because the fragile population requires successful calving seasons to remain viable. Only about 70 reproductive-age females remain, and annual calf counts have surpassed 20 only a few times since 2010. Between 2010 and 2020, the population dropped by roughly 25 percent. The whales face severe risks from ship collisions and fishing gear entanglements, compounded by ocean warming shifting them outside protected waters. In 2018, zero births were recorded. Extensive photographic cataloging of the whales makes unrecorded births a rarity, which makes this late-season discovery particularly notable for researchers.
How did the calf evade detection for so long?
The calf was spotted by the Mingan Island Cetacean Study, a non-profit based in Quebec’s Côte-Nord region, after it was missed during boat and aerial surveys along the U.S. East Coast all spring and summer. The calf, weighing an estimated 15,000 pounds (6,804 kilograms), was one of the rarest sea mammals in the world to have gone unseen for months. Richard Sears, founder and director of the study, celebrated the calf's addition to a successful breeding year. "It just goes to show you how big the ocean is, and how those animals can get lost out there," he said. The specific sighting occurred in the Jacques-Cartier Passage in the Gulf of St. Lawrence on September 25, 2026.
What are the ongoing threats to right whales?
Though calf numbers have rebounded slightly since 2020, the species remains critically endangered. Conservationists have condemned recent U.S. government decisions to delay new species protections for a decade to aid commercial fishing. The primary dangers continue to be vessel strikes and entanglement in fishing gear, which can cause fatal injuries or chronic stress that reduces reproduction. Your Space Hamilton reported in November that an entangled right whale was spotted in the Gulf of St. Lawrence, highlighting the persistent threat. The whales' migration patterns are also shifting due to warming ocean temperatures, moving them into areas with fewer protections and higher shipping traffic.
What does this mean for the species' future?
The identification of this calf provides a rare piece of positive news for a species in dire need of recovery. Researchers will continue to monitor Silt and her offspring as they feed in Canadian waters. The 24 calves born this season represent a crucial boost, but scientists stress that continued high mortality from human-caused threats could quickly erase these gains. The success of this birthing season shows the importance of ongoing surveillance and protective measures throughout the whales' migratory range.
With files from Portland Press Herald, Ottumwa Courier and Newswav