The Underwater Zebra

The orca, or Orcinus orca as referred to within the scientific community, is a distinct wildlife species whose very name is shaped by two commonly accepted misconceptions. Although the word “orca” is often used interchangeably with the colloquial title “killer whale,” orcas are neither whales nor “killers” in the way the name suggests.

This nickname originated when sailors reported witnessing these huge animals gruesomely disposing of whales and similar counterparts. As a result, the term “whale killer” eventually evolved into “killer whale,” and the name stuck. Although orcas are commonly referred to as whales due to their sheer mass, they are actually more closely related to dolphins within the cetacean family. They are essentially dolphins that can grow up to 33 feet and 22,000 pounds (10 metric tons). Due to their size alone, orcas are often seen aggressively toying with their comparatively smaller prey. 

Orcas and their dolphin counterparts are often considered some of the smartest animals in the world, challenging the long-standing assumption that great apes such as gorillas and chimpanzees are the most intelligent wildlife species behind man. This extensive intelligence leads orcas to be naturally curious, sometimes approaching humans simply to investigate.

Furthermore, orcas possess large brains, second only to humans in brain-to-body ratio among mammals. Their cerebral cortex, the outer layer of the brain responsible for thinking, planning, memory, and problem-solving, along with their limbic system, which governs emotional processes, is highly developed compared to other species. This development extends beyond typical wildlife, as scientists have noted that orcas possess brain structures that humans do not, suggesting they may even have enhanced social awareness and emotional intelligence.

One reason for this intelligence is that the orca’s cortex is highly gyrified, meaning it has more folds and wrinkles or gyri and sulci compared to the human brain. These folds matter because more folds equal more surface area for neurons. Greater surface area allows for increased processing power without requiring a larger skull. This complexity suggests a higher cognitive capacity, which includes the ability to handle abstract thought, memory, learning, and emotion. In short, the more “ripples” in a brain, the more potential for complex thinking.

On the other hand, the limbic system is the emotional center of the brain, responsible for emotions such as fear, joy, empathy, grief, and bonding. Orcas and dolphins have extremely complex systems. This suggests they may feel emotions more deeply or even differently than humans. This is evident in the way they form lifelong bonds and visibly grieve losses.

Their emotional intelligence may even be more specialized for social cohesion, as it likely evolved from their inherently complex social structures. Orcas typically live in small, tight-knit groups that organize complex group behaviors for mating and hunting. They can swim up to 40 miles a day, foraging for food or simply exercising, and regularly dive between 100 to 500 feet multiple times daily throughout their lives. Whether in captivity or in the wild, all orcas are born with this intrinsic drive to swim far and dive deep.

Behavioral Patterns

Different orcas specialize in different prey, including bony fish, seals, sea lions, penguins, and even large mammals such as beluga whales. Although all orcas are considered one species, some exhibit distinct differences in behavior, appearance, and size.

These differences are especially evident between resident and transient populations. Resident orcas remain in one area and typically eat fish, while transient populations migrate and primarily hunt marine mammals. At times, transient populations overlap with resident ones, especially in coastal waters. Due to these differences in behavior and diet, some scientists theorize that there may be up to 16 distinct species of orcas.

One aspect of orca behavior that remains consistent, however, is their unusual relationship with humans. Despite their dominance as predators, wild orcas do not typically view humans as prey and have not been known to attack humans unless held in captivity.

Orcas are known to pass down communication methods and hunting techniques to younger generations, creating distinct pod cultures. These pods function like families, and individuals often remain with their pod for life, which can span from 40 to 90 years depending on gender and conditions. Pods are led by a maternal grandmother, with all members belonging to her family line.

Within these pods, females hold the most authority. The matriarch passes down knowledge, language, and traditions. Baby orcas are born solely capable of vocalizing through loud shrieks, which differ from established pod languages. Through guidance from female members, they gradually learn how to hunt and communicate effectively.

Maternal grandmothers are known to care deeply for their pods, sometimes giving up 90 percent of the food they catch to others. A notable example of their maternal instinct occurred in Argentina, where female orcas were observed teaching younger members how to beach themselves to catch seals during low tide. They even practiced using seaweed before attempting real hunts.

Orcas communicate using three primary methods:clicktraining, whistling, and pulsing. Click training is used for echolocation, helping them locate prey. This occurs when an orca pushes air through its blowhole, producing high-pitched sounds that bounce off objects and return to fatty tissue in their lower jaw. This system allows them to detect prey with extreme precision, even distinguishing between species such as different types of salmon.

Whistling is used for private communication within pods, while pulsing is used to coordinate group attacks. During hunts, the matriarch may initiate pulsing signals to direct the pod. For example, when targeting a seal on ice, orcas may work together to create waves that break the ice, isolate the seal, and ultimately capture it.

Transient orcas tend to be quieter, often avoiding echolocation to remain undetected by prey. They usually travel in smaller groups of around three members.

Orcas also use physical behaviors such as breaching (jumping out of the water) and tail slapping to communicate. Their black-and-white coloration serves as camouflage, helping them blend in with both the ocean surface and depths depending on perspective. This is an evolutionary tactic strategy known as countershading. This contrast can also disrupt their outline, making them harder for prey to detect.

In one observed case, over 60 orcas from multiple pods cooperated to kill an endangered whale, demonstrating that even pods with different “languages” can communicate and work together.

Each pod has its own unique communication system. In one study comparing two pods, one used 23 distinct sounds while the other used 24, with no overlap between them.

Orcas also possess an incredibly powerful bite force of approximately 19,000 PSI, compared to a shark’s 4,000 PSI. Their intelligence and strong social bonds are evident in their grieving behaviors, as they have been observed mourning pod members for days.

Mating

Orcas give birth to live young that can swim immediately but remain close to their mother, nursing for one to two years. Females reach sexual maturity between ages 10 and 13 and have a gestation period of 15 to 18 months, typically giving birth to a single calf. There is no specific calving season, and births can occur year-round.

Birth rates are not fully understood but are estimated to occur every 3 to 10 years, with some populations averaging every 5 years over a 25-year period. Orcas also experience menopause, similar to humans.

In many cases, juveniles eventually separate from their mothers, though some remain with their original pod for life. Their intelligence and social complexity have contributed to protections against hunting in many regions.

How Are Orcas Being Hurt?

1. Captivity

Orcas in theme parks and aquariums often suffer severe psychological and physical harm. They experience depression, aggression, collapsed dorsal fins, and shortened lifespans. In captivity, they are separated from their families and forced into unnatural social groups within confined spaces. The documentary Blackfish exposed the cruelty of keeping orcas like Tilikum in captivity.

2. Noise Pollution

Ships, sonar, and industrial activity interfere with orcas’ echolocation, communication, and hunting abilities.

3. Pollution and Toxic Chemicals

Orcas accumulate toxins such as PCBs in their blubber, weakening immune systems and affecting reproduction.

4. Food Shortages

Overfishing, particularly of salmon, threatens certain populations, such as the Southern Resident orcas.

5. Climate Change

Rising ocean temperatures and melting ice disrupt prey availability and migration patterns.

 Organizations You Can Get Involved With

1. The Humane Society of the United States (HSUS)

Works to end marine mammal captivity through advocacy, legal campaigns, and public outreach.

2. Oceanic Preservation Society (OPS)

Collaborates with artists and activists to raise awareness through media and digital advocacy.

3. NYC for Animals

Advocates for animal rights and participates in protests, outreach, and education.

4. Earthjustice

A legal organization focused on protecting endangered species and marine ecosystems.

5. New York Aquarium

Provides marine education and supports conservation efforts through programs and events.

Scientists warn that if orcas can't survive, we won't either.

Mark Leiren-Young, Orcas Everywhere.