Described when first encountered in 1835, this species “must have weighed at least 200 pounds … gave a deep hiss & drew in its head”
The Final Jeopardy clue for Thursday, October 1, 2026, appeared in the category “Historic Zoology” and read: “Described when first encountered in 1835, this species ‘must have weighed at least 200 pounds … gave a deep hiss & drew in its head.’” The clue points to one of the most famous animals associated with Charles Darwin’s voyage aboard the HMS Beagle. The correct response is the Galápagos giant tortoise.
What Is the Galápagos Giant Tortoise?
The correct response is the Galápagos giant tortoise. Charles Darwin encountered these enormous reptiles during the Beagle’s visit to the Galápagos Islands in 1835 and described them in vivid detail.
Darwin wrote of meeting two large tortoises, estimating that each weighed at least 200 pounds. One was eating cactus, while the other reacted to his approach by giving a deep hiss and withdrawing its head.
Darwin’s 1835 Visit to the Galápagos
Darwin reached the Galápagos Islands in September 1835 while serving as the naturalist aboard HMS Beagle. His observations there later became an important part of the story surrounding the development of his ideas about evolution.
On San Cristóbal, then commonly called Chatham Island, Darwin explored a landscape of volcanic rock, sparse vegetation and unusual wildlife. It was in this environment that he encountered the giant tortoises described in the clue.
The Tortoises That Impressed Darwin
Darwin was struck by both the size and appearance of the animals. The huge reptiles moving through black lava and cactus-filled terrain seemed to him almost prehistoric.
His description of the hissing tortoise is especially memorable because the sound was not necessarily an aggressive warning. Giant tortoises can produce a hiss-like noise when rapidly pulling their heads and limbs into their shells as air is forced from their lungs.
How Large Can Galápagos Giant Tortoises Become?
The Galápagos giant tortoise ranks among the largest living tortoises in the world. Large individuals can weigh several hundred pounds, making Darwin’s estimate of more than 200 pounds entirely plausible.
Their extraordinary size became one of the defining characteristics of the islands. The animals also became famous for their longevity, with some individuals living for well over a century.
Different Tortoises on Different Islands
Darwin learned during his visit that residents could sometimes identify which island a tortoise came from simply by looking at the shape of its shell. Different island populations had developed noticeably different forms.
Some had domed shells suited to areas with plentiful low vegetation, while others developed more elevated openings at the front of the shell, allowing their necks to reach higher vegetation.
Why the Galápagos Became So Important to Darwin
Darwin did not arrive in the islands with a fully developed theory of evolution. His observations from the voyage were instead among the pieces of evidence he later reconsidered while developing his ideas about how species change over time.
The differences among Galápagos animals, including tortoises, mockingbirds and finches, helped raise questions about how related populations could become distinct after living in different environments.
Why This Final Jeopardy Clue Works
The date of 1835 is the strongest historical signal in the clue, immediately connecting the description with Darwin’s famous visit to the Galápagos. The extraordinary weight, reptilian behavior and reference to pulling in its head further narrow the answer.
The correct Final Jeopardy response is therefore the Galápagos giant tortoise, one of the most famous animals Darwin encountered during the voyage that helped reshape the history of biology.