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This is how a blue whale feeds her baby underwater. Blue whale nursing is a fascinating feat of underwater engineering. Since calves can’t "latch" and suckle like land mammals (they’d swallow too much saltwater), the process is more like a high-pressure injection. When the calf is ready, it nudges the area, and the mother uses her abdominal muscles to voluntarily squirt the milk into the calf's mouth. The milk is incredibly rich—about 35% to 50% fat. This gives it a consistency similar to soft butter or toothpaste, which helps it stay in a cohesive clump underwater rather than dissolving. The calf curls its tongue into a "U" shape to create a straw-like funnel, ensuring the nutrient-dense milk goes straight down its throat. This high-speed feeding allows a calf to drink over 200 liters of milk a day, gaining about 90 kg (200lbs) every single 24 hours.