Springtime Whale and Seal Watching on the Sonoma Coast
By Norma Jellison
Spring on the Sonoma Coast offers residents of the County, as well as visitors, many amazing visual delights - wildflowers everywhere, migrating Pacific Gray Whales, Pacific Harbor Seal pups, especially at the Goat Rock Beach colony, and birds in breeding plumage and sitting on nests on the rocks off the coast that are part of the California Coastal National Monument.
And, usually, spring delivers great weather to get out, explore, hike and enjoy all of the above.
Bodega Head, jutting out into the ocean, is an especially good vantage point to take in great views of Pt Reyes to the south, the Bay itself and the Doran Beach sand spit, Bodega Rock with its gregarious, noisy Sea Lions and the passing marine mammals and pelagic birds.
Stewards of the Coast and Redwoods (Stewards) Whale Watch volunteers are at Bodega Head Saturdays and Sundays Noon to 4PM (weather permitting, save Fisherman’s Festival weekend April 14/15 this year) from January to May to share information and help visitors search for whales.
Started over 30 years ago, both Whale Watch and Seal Watch at Goat Rock State Beach in Jenner were the first Stewards volunteer programs. Today, there are many more programs, along with classes, hikes and volunteer opportunities offered via their website:
Whale Watch volunteers share Gray Whale exhibits (whale bones, barnacles, whale lice, krill) and help visitors search for the Pacific Gray Whales migrating past the Head. The tell tale heart shaped, bushy blow rising up from the ocean surface announces a whale. Everyone gets excited hoping to see that again and again. And perhaps a view of some back, a tail or, if especially lucky, a full breach out of the water.
The Gray Whales that were swimming by the Head going south in February and into March were juveniles. They don’t go to the mating and calving lagoons in Baja California, as they are not sexually mature. They will turn around and head north, as the lagoons empty out and the adults' northbound migration gets into full swing.
The first whales to pass by going north are the newly pregnant females. They are headed for the Alaskan feeding grounds (Bering, Chukchi and Beaufort Seas).
Gray Whales depend on blubber stored from the summer feeding frenzy to sustain them on their 5-6,000 mile migration south, the time they spend in the lagoons, as well as on the 5-6,000 mile return trip north back to the feeding grounds. They will feed opportunistically mostly during the northbound migration, inhaling krill or mysid shrimp for example. However, when they pass by the Head, for the most part, they have not eaten much since the previous summer.
Thus, the newly pregnant females are intent to reach the Arctic seas, where they will eat tons of amphipods (tiny benthic crustaceans) daily until the seas ice over. Then they will head back south to have their calves - 13 months later.
Most of the calves are born in the warm, high saline content (buoyant) waters of the lagoons on the Pacific side of Baja Sur in Mexico. Some are born on the way south, mostly off southern California.
At birth, calves weigh 1500-2000 lbs and are 15-20 feet. Mom will feed the calf 50 gallons of milk a day (!) and teach it to swim. The calves double in size and weight while in the lagoons. When Mom decides the calf is ready, she will lead it north to Alaska.
Mid-April through May is prime time to see the northbound mothers and calves from the Head. Swimming close to shore allows the calves to rest in coves along the way and Mom to easily nurse. Gray Whale moms nurse their calves the entire way from Baja to Alaska. This continues into August and September on the Arctic feeding grounds, by which time the calves learn to feed on the bottom-dwelling amphipods, along with the rest of the population.
Keeping the calf between her and the coastal hills is also a tactic to protect the calf from predation by Orca. Although called Killer Whales, the Orca is the largest dolphin and uses eco-location to find its prey.
While the Pacific Northwest Orca (residents) eat salmon, the Orca ecotype Biggs (transients) preys on marine mammals, especially seals and Gray Whale calves. Keeping the calf on the inside of the mother Gray Whale (45-55 foot/30-40 tons) between her and the coastal hills “hides” the calf. If the Orca echolocates off her and misses the calf, it likely won’t attack Mom.
Dolphins are highly intelligent and these marine mammal-eating Biggs Orca have become accustomed to attacking Gray Whale calves, especially in Monterey Bay. The Bay is deeper than the Grand Canyon, wide and has relatively no place to hide.
The Orca mothers teach their calves to hunt there and the adults are on the prowl as well. While the mother Gray Whale will often put up quite a fight, many Gray Whale calves are lost in Monterey Bay every year. Not necessarily a pretty picture for the passengers on whale watch boats, but certainly an example of how these highly intelligent dolphins have found and take advantage of an opportunistic place to successfully hunt.