Blue whale births remain unseen because they occur in winter, when researchers typically aren't observing them. By the time ...

Endangered pygmy blue whales dive to depths in the ocean to forage and feed along their migratory path off the Western ...

But across various blue whale populations, high pregnancy rates of 33-50% annually seem to contradict the average 3.1% rate of sightings of blue whales involving mother-calf pairs.