Calves drink 50-80 pounds of milk each day. Gray whales reach maturity at 8 years. Growth stops at age 40 years old. Mature females give birth every other year in the warm lagoons off Baja, Mexico. LIFE SPAN Gray whales have a life expectancy of 50-60 years.
Gray whales are a protected species.
They are one of 76 cetacean species, and are marine mammals.