Spinner Dolphins
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40 free Spinner Dolphins trivia questions with answers — trivia quiz, new questions added Oct 2026.
Spinner dolphins are the acrobats of the dolphin world. They burst out of warm seas and whirl in the air like a thrown football, again and again, and scientists are still working out exactly why they do it. These fun facts come as quiz questions. They cover the spinning itself, the long nights these dolphins spend hunting in deep water, the quiet daytime hours they need to recover, the animals that prey on them, the places around the world where people go to watch them, and the fishing and tourist pressure that has put them at risk. The quiz is written for ocean lovers, snorkellers, students and anyone who has watched a pod leap beside a boat and wanted to know more. Every answer comes with a short explanation, so you will pick up something new even on the ones you miss.
30 of 40 questions with answers and explanations. Play the quiz
Q 01How do resting spinner dolphins manage to keep swimming and surfacing for air while they sleep?
Half the brain stays awake
Half the brain stays awake while the other half sleeps, so a resting spinner dolphin can still swim slowly and come up to breathe. A quiet school drifting near shore may well be asleep.
Q 02Toxoplasmosis, a disease that has killed Hawaiian spinner dolphins, reaches the sea from which animal's droppings?
Cats
Cats shed the parasite's eggs in their droppings, and rain can wash them down to the coast. Fatal infections have been confirmed in spinner dolphins off Hawaii.
Q 03Which small shark leaves round crater scars on nearly every adult spinner dolphin off Hawaii?
Cookiecutter
The cookiecutter shark gouges out round plugs of flesh, as if with a cookie cutter. Its bite marks have turned up on whales, big fish and even submarines.
Q 04Wartime sonar crews mistook the dense layer of sea life that spinner dolphins feed on for what?
The seabed
The seabed seemed to sit far too shallow and to rise after dark, so the layer became known as the false bottom. It is really millions of small animals whose bodies bounce the sound back.
Q 05Off Oahu, how do night-hunting spinner dolphins bunch up their prey before pairs dart in to feed?
Circling it together
Circling it together, the school packs its prey into a tight patch, and then a pair at a time swims through the middle to make a catch.
Q 06Which hitchhiking fish, gripping with a sucker on its head, can a spinner dolphin's spins shake off?
Remora
Remora suckerfish clamp onto a dolphin's skin and add drag, so a hard, spinning splashdown is thought to be one way of knocking them loose.
Q 07What filmed 33 swimmers accused of harassing spinner dolphins off Hawaii's Big Island in 2023?
A drone
A drone caught the group chasing dolphins that were trying to get away. Swimming within 50 yards of Hawaii's spinner dolphins has been against federal rules since 2021.
Q 08While resting in shallow bays, spinner dolphins stop echolocating and rely on which sense instead?
Vision
Vision takes over while the sonar is switched off, which is why resting schools keep to clear, calm shallows where they can see what is coming.
Q 09Which remote Pacific atoll, scene of a pivotal 1942 naval battle, has spinner dolphins living in its lagoon?
Midway
Midway Atoll has a resident pod of about 300 spinner dolphins in its lagoon and nearshore waters, alongside monk seals that raise their pups on the beaches.
Q 10Besides shedding hitchhikers, what do experts think a spinner dolphin's noisy, splashy spins are mainly for?
Communication
Communication is the leading idea: each splashdown makes a burst of noise that carries through the water to schoolmates that are out of sight.
Q 11Which tuna species swims beneath schools of spinner dolphins, a habit that keeps drawing fishing fleets to them?
Yellowfin
Yellowfin tuna follow the dolphins in search of food, so crews learned to find the valuable fish by looking for schools of leaping spinners.
Q 12Which kind of tuna net, set around whole dolphin schools, killed tens of thousands of spinner dolphins?
Purse seine
Purse seine nets are drawn shut at the bottom like a drawstring bag, trapping whatever is inside. The deaths led to dolphin-safe labels on canned tuna.
Q 13Which dolphins often travel in mixed schools with spinner dolphins in the open eastern Pacific?
Spotted
Spotted dolphins and spinners swim together so often in the eastern Pacific that one long-held idea is that the mixed school helps keep resting spinners safe.
Q 21Spinner dolphins belong to the genus Stenella, a name built from a Greek word with which meaning?
Narrow
Narrow is what the Greek stenos means. The name was coined in 1866 by the same London zoologist who had first described the spinner itself decades earlier.
Q 22Which Atlantic dolphin arose as a natural hybrid of the spinner dolphin and the striped dolphin?
Clymene
The Clymene dolphin is the only confirmed case of a hybrid-born species among all the whales, dolphins and seals, and until 1981 it was classed as a kind of spinner.
Q 23Spinner dolphins belong to which major group of cetaceans, the one that also includes belugas and narwhals?
Toothed whales
Q 14Which small deep-sea fish, named for their glowing light organs, are the spinner dolphin's main prey?
Lanternfish
Lanternfish hide in dark, deep water by day and swim up toward the surface after sunset, which is when spinner dolphins dive down to meet them.
Q 15Spinner dolphins hunt animals from the ocean's mesopelagic layer, better known by which nickname?
Twilight zone
Twilight zone is the popular name for the dim band between roughly 200 and 1,000 metres down, where only a trace of sunlight arrives.
Q 16Which spot on Hawaii's Big Island, where Captain Cook was killed in 1779, is a noted spinner dolphin resting place?
Kealakekua Bay
Kealakekua Bay on the Kona coast is where the dolphins come in most mornings to rest and to nurse their young in calm, sheltered water.
Q 17Which Brazilian archipelago, a UNESCO World Heritage Site, is famed for its resident population of spinner dolphins?
Fernando de Noronha
Fernando de Noronha earned its UNESCO listing partly because of its resident spinner dolphins, and one of its best-known bays is simply called Dolphins Bay.
Q 18Which 1972 US law makes it illegal to harass, hunt, capture or kill a spinner dolphin?
Marine Mammal Protection Act
The Marine Mammal Protection Act covers every whale, dolphin and seal in US waters, endangered or not. Under it, even disturbing a resting school can count as an illegal "take".
Q 19Researchers identify individual spinner dolphins by photographing the nicks and notches on which body part?
Dorsal fin
Dorsal fin shape and damage work like a fingerprint, letting scientists follow the same dolphin for years from photographs alone.
Q 20The spinner dolphin's species name, longirostris, is Latin for which of its features?
Long beak
Long beak is the translation, and older books simply call the species the long-snouted dolphin.
Toothed whales have teeth instead of baleen and find their prey by echolocation. Dolphins, the spinner included, are simply smaller members of the group.
Q 24Which largest member of the dolphin family is listed among the spinner dolphin's possible predators?
Killer whale
The killer whale, or orca, is itself an outsized dolphin, though sharks are the hunters that spinner dolphins have to watch for most.
Q 25Which term describes spinner dolphin society, where huge night-time schools split into small daytime groups?
Fission-fusion
Fission-fusion means the group keeps breaking up and re-forming: hundreds feed together after dark, then as few as a dozen may rest together by day.
Q 26Which spinner dolphin calls, separate from their echolocation clicks, may be used to organise the school?
Whistles
Whistles carry between animals and may help keep a travelling school in order, while rapid burst-pulse sounds round out the repertoire.
Q 27Which camouflage scheme describes the spinner dolphin's dark grey back, lighter sides and pale belly?
Countershading
Countershading puts the dark colour on top and the pale underneath, a disguise shared with sharks that is thought to blend an animal into its background from above and from below.
Q 28Which SeaWorld co-founder, a pioneer of dolphin echolocation research, wrote Dolphin Days about the spinner dolphin?
Kenneth Norris
Kenneth Norris gave the book the subtitle The Life & Times of the Spinner Dolphin, and he taught at UCLA and UC Santa Cruz.
Q 29Which Indian Ocean island nation has morning boat trips to watch spinner dolphins in Tamarin Bay?
Mauritius
Mauritius draws visitors to Tamarin Bay, where spinner and bottlenose dolphins are usually seen early in the day before they head back to the open sea.
Q 30Resting Hawaiian spinner dolphins favour bays with which kind of bottom, against which predators are easier to see?
White sand
White sand makes a pale backdrop that shows up an approaching shark, and the chosen bays also lie close to the deep water where the dolphins feed.