The marine ecosystem of California is both vibrant and diverse, boasting an array of majestic creatures, from the smallest microorganisms to the most massive marine mammals. One of the ocean’s most iconic inhabitants, the orca or killer whale (Orcinus orca), has attracted a significant amount of fascination and intrigue due to its striking appearance, formidable hunting abilities, complex social structure, and enduring presence in human culture.
In May, an uncommonly large grouping of orcas for Northern California — around 20 to 24 animals — was spotted by a whale-watching tour off the coast of San Francisco, likely gathered together to celebrate a successful hunt for sea lions or seals.
“I screamed ‘orca!’” Michael Pierson, an Oceanic Society naturalist leading the tour, told KTLA “those distinct dorsal finds poking out of the water.”
“It was really, really special,” Pierson said.
In June, a crowd of 30 killer whales met for a whale party in California’s Monterey Bay. Observers said they did belly flops into the water, slapped the waves with their flukes and spumed water from their blowholes, surprising marine biologists who had never seen the animals engage in such playful behavior for such a long period.
“Just like kids that are in a park, they get excited and play with the other kids and may be more active,” said Nancy Black, a marine biologist with Monterey Bay Whale Watch and the director of the California Killer Whale Project. “The little ones were wrestling and rolling like a bunch of puppies.”
An astonishing video last May showed a group of 30 orcas attacking two grey whales near Monterey. “We were able to observe the unique hunting strategies of the pods and the rarely seen defensive strategies of the two Grays,” Monterey Bay Whale Watch said. “The battered gray whales eventually made it to shallow water, and the orcas broke off.”
Black’s California Killer Whale Project has spent thirty years cataloging the killer whales that spend time in Monterey Bay. The group is able to recognize many of the whales by their spotted markings and the common tail notches.
The whales are rarely seen further south of Monterey, but another whale-watching tour off the coast of Southern California spotted a pod of killer whales last April, just off Newport Beach. The viewing included a rare glimpse of a three-year-old albino calf named Frosty due to its white appearance. (The white skin of the whale may not be albinism, per see. Several known conditions cause certain animals, including orcas, to look white. One condition is the extremely rare leucism, which is a genetic condition that causes the unusual coloring and the pigmentation of the skin to be paler. The other is Chediak-Higashi syndrome, an inheritable immune deficiency that can cause partial albinism.)
The term “killer whale” is a bit of a misnomer. Killer whales are actually dolphins and the largest species of the family Delphinidae. An adult male can typically grow up to 26 feet long and weigh up to 6 tons, while females are typically smaller. That said, The largest recorded male killer whale was 9.8 m (32 ft.) in length and weighed 10,000 kg (22,000 lbs.) The largest recorded female was 8.5 m (28 ft.) and weighed 7,500 kg (16,500 lbs.). They are known for their distinctive black and white coloration, with a dark dorsal side and a lighter ventral side. The tall, triangular dorsal fin of a male orca, which can reach heights of up to 6 feet, is a distinguishing characteristic.
Orcas are warm-blooded mammals, with an impressive ability to regulate their body temperature even in the cold waters off California’s coast. Their thick layer of blubber not only insulates them but also acts as a reservoir of energy when food is scarce.
Killer whales are top predators and display a diverse diet, although their food preference varies depending on the population. They are known to feed on fish, squids, seals, sea lions, and even other whales. In California waters, salmon, particularly Chinook, is a crucial part of their diet, but they also consume marine mammals such as sea lions and seals.
In orca societies, females generally choose the mates. Gestation lasts for about 17 months, with females giving birth every 3 to 10 years. The mother-calf bond in orcas is remarkably strong, often lasting for a lifetime. Orcas are known for their complex social structures, including matrilineal groups comprising grandmothers, mothers, and their offspring.
Killer whales are found in oceans worldwide, from the frigid Arctic and Antarctic regions to tropical seas. In California, they are most frequently sighted in Monterey Bay, the Gulf of the Farallones, and along the northern coast near the Oregon border. They migrate following their prey, and their appearance in California waters often aligns with the migration of gray whales, a favorite prey species.
Orcas have been popular in human culture, depicted in indigenous art, folklore, and mythology. Their image was catapulted into the modern mainstream by the 1993 film “Free Willy.” Yet, their captive display in marine parks like SeaWorld has sparked controversy and fueled a significant shift in public perception towards marine mammal captivity. The 2013 documentary “Blackfish” shed light on the stressors faced by these magnificent creatures in captivity, leading to policy changes and declining popularity of such exhibits.
Orcas are not typically dangerous to humans in the wild, and there are very few documented cases of wild orcas attacking people. However, tragic incidents involving captive orcas and their trainers have occurred, which some attribute to the psychological stress of captivity.
Despite their wide range and lack of natural predators, orcas face significant threats due to human activities. These include pollution, overfishing of their prey, habitat degradation, and noise disturbances. In some parts of the world, orcas are hunted for their meat and blubber.
All killer whales are protected under the Marine Mammal Protection Act (MMPA) and the Southern Resident population is listed as an endangered species under the Endangered Species Act (ESA).
The majesty and power of the orca have undeniably earned it a special place in human imagination and culture. Yet, it’s crucial to understand and respect these creatures in their natural habitat, to learn from them, and to work towards preserving the marine ecosystems they call home. California’s orcas are a testament to the incredible life thriving in our oceans, a life we must commit to protecting.
