Season ends with 23 mother-calf pairs as whales make their way north
BOSTON, MASS. (April 29, 2026) – The North Atlantic right whale calving season has come to a close with the highest number of calves recorded since 2009.
The annual calving season in the southeastern United States, which runs from mid-November until mid-April, produced 23 mother-calf pairs, the fourth-highest count ever. It’s positive news for the critically endangered species with an estimated population of about 380.
Scientists with the Anderson Cabot Center for Ocean Life at the New England Aquarium have been tracking the season closely and were pleased to see shorter intervals between calving for the majority of the whale moms.
“While a healthy right whale can give birth every three to four years, we had been seeing nearly 10 years between calves for some females. Many of this year’s moms have had shorter intervals—18 of them previously gave birth within the last six years—giving us hope that they may be healthier and can help grow the population faster,” said Amy Warren, Scientific Program Officer in the Aquarium’s Anderson Cabot Center.
Aerial survey teams from Florida, Georgia, and the Carolinas conducted regular flights on the calving grounds throughout the season. By the end of the calving season, most of the right whales had begun migrating north. At least 18 of the 23 mother-calf pairs have been seen in Massachusetts waters so far this spring. Research teams from the New England Aquarium’s Anderson Cabot Center have documented over one-third of those pairs in Cape Cod Bay this past month.
In collaboration with a network of individuals and research organizations along the eastern seaboard, scientists in the Aquarium’s Anderson Cabot Center curate the North Atlantic Right Whale Catalog, an extensive photo-identification database that allows them to track right whales’ life stories including births, injuries, migration patterns, and age to create detailed histories of each individual whale. Scientists use this information to create a detailed list of mom-calf pairs with biographical information each calving season. This season’s list is available on the Aquarium’s website.
“It is hopeful to see 23 new calves born this year, but their survival into adulthood is still a long journey ahead in an ocean with many dangers and obstacles,” Warren added.
Right whales are experiencing an Unusual Mortality Event precipitated by increased injuries and deaths from human impacts, which is affecting the animals’ ability to survive and reproduce. While conservation and management efforts have progressed, the critically endangered species still faces threats including fishing gear entanglements and vessel strikes.
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