Question 1

True or false: Marine iguanas are native to both the Galápagos Islands and the coast of Ecuador.

Accepted Answer

False. They are endemic only to the Galápagos Islands, not found on mainland Ecuador or anywhere else in the world.

Question 2

True or false: Marine iguanas are the only lizards in the world that forage in the ocean.

Accepted Answer

True. They dive to eat algae, making them uniquely marine among modern lizards, found only in the Galápagos.

Question 3

True or false: Marine iguanas are warm-blooded and can maintain a constant body temperature even in cold ocean waters.

Accepted Answer

False. They are cold-blooded ectotherms; they bask on rocks to warm up and cool down in the water, shivering to raise temperature.

Question 4

True or false: Male marine iguanas have brightly colored red and green scales to attract females during mating season.

Accepted Answer

False. Males do become more colorful, but typically in black, red, or green patches, not bright neon; it's subtle and seasonal.

Question 5

True or false: Marine iguanas can hold their breath underwater for over an hour while feeding on algae.

Accepted Answer

False. They typically hold their breath for 10–15 minutes max, though they can occasionally reach 30 minutes in rare cases.

Question 6

True or false: Marine iguanas can sneeze out salt from their nostrils to remove excess salt from their bodies.

Accepted Answer

True. They have special salt glands that expel salt crystals via sneezing, a key adaptation for a marine diet.

Question 7

True or false: Marine iguanas have a third eye on top of their head that detects movement from predators above.

Accepted Answer

True. Called a parietal eye, it’s a light-sensitive spot that helps them spot birds or other threats from above.

Question 8

True or false: During El Niño events, marine iguanas can shrink their body length by up to 20% to survive food shortages.

Accepted Answer

True. They can actually reabsorb bone tissue, shrinking in size to reduce energy needs when algae is scarce.

Marine Iguana Trivia Questions