The gray whale (Eschrichtius robustus), [1] also known as the grey whale, [5] is a baleen whale that migrates between feeding and breeding grounds yearly. It reaches a length of 14.9 meters (49 ft), a weight of up to 41 tonnes (90,000 lb) and lives between 55 and 70 years, although one female was estimated to be 75–80 years of age.

2024年10月31日 · The number of gray whale calves migrating with their mothers along the California Coast this year was one of the lowest on record. The population is still regaining ground after an Unusual Mortality Event that resulted in a sharp decline in overall population numbers.

Monitoring gray whale condition and annual calf production are primary focus areas of our gray whale research at Southwest Fisheries Science Center. We estimate the number of gray whale calves born each year and assess the body condition of individual whales during their northward migration in the spring.

2024年11月26日 · A gray whale and her calf migrate north along the California coast on their way to summer feeding grounds in the Arctic. Scientists are using an unmanned aerial vehicle to produce very precise overhead images of gray whales, then analyzing the images to understand how environmental conditions affect the health of adult females and ultimately ...

2022年5月5日 · Successful Rehabilitation of JJ, the Gray Whale. In January 1997, a very young California gray whale was rescued near Marine del Rey, Los Angeles, and delivered to SeaWorld of California in San Diego. She was semi-comatose, severely infested with whale lice, and had numerous cuts and ulcers over her body.

Gray whales go to the warm waters near Mexico to mate and to have calves. After a twelve month pregnancy, a female gray whale will give birth to a calf typically 14-16 feet (4-5 m) in length and about 2,000 pounds (907 kg).

2023年10月12日 · We combined 31 estimates of eastern North Pacific gray whale abundance over 54 years (1968 to 2022) (24), 30 estimates of calf production over 42 years (1980 to 2022) (22, 25), 1391 records of stranded gray whales on the United States coastline over 48 years (1974 to 2022), and 1334 body condition measurements over 32 years (1987 to 2019) (26) i...

Females have a 12–13 month gestation period, and give birth to a single calf every two or more years. Calves nurse for seven to eight months on milk that is 53% fat (human milk is 2% fat). At birth, calves average 15 ft (4.5m) in length and weigh about 1,100–1,500 lbs (500–680kg).

Gray whales reach sexual maturity at 5-11 years of age, or when they reach 36-39 feet (11-12 m) in length. Gestation is 12-13 months. The calf weighs 1,100-1,500 pounds (500-680 kg) and is about 15 feet (4.5 m) at birth. Calves nurse 7-8 months on milk that is …

Eastern North Pacific gray whale calls (40 Hz- 4 kHz) have been detected throughout their range and across all seasons. Calls tend to peak during early morning and evening. The most abundant sound produced by the gray whales in their breeding lagoons is a low-frequency, pulsed “S1” (knock) call, which is produced in “bursts” or “bouts”.