Described when first encountered in 1835, this species “must have weighed at least 200 pounds … gave a deep hiss & drew in its head”

Thursday, October 1, 2026’s Final Jeopardy clue came from “Historic Zoology”: “Described when first encountered in 1835, this species ‘must have weighed at least 200 pounds … gave a deep hiss & drew in its head.’” Those words come from Charles Darwin’s account of one of the remarkable animals he saw during his visit to the Galápagos Islands. The answer is the Galápagos giant tortoise.

What Is the Galápagos Giant Tortoise?

The animal described is the Galápagos giant tortoise, the enormous land tortoise native to the Galápagos archipelago in the Pacific Ocean.

When Darwin came across two of them in 1835, he estimated that both weighed at least 200 pounds. One slowly moved away from him, while the other pulled its head into its shell and produced the deep hissing sound quoted in the clue.

A Famous Encounter on San Cristóbal

Darwin made the observation while exploring San Cristóbal, one of the islands visited by HMS Beagle. At the time, the island was generally known to Europeans as Chatham Island.

He described a harsh volcanic setting filled with black lava, leafless shrubs and large cacti. The presence of enormous tortoises wandering through the landscape made the scene seem especially strange and ancient to him.

Why Giant Tortoises Hiss

The reference to a “deep hiss” gives the clue one of its most distinctive details. Giant tortoises often retreat into their shells when startled.

As the head and limbs withdraw, air can be expelled quickly from the lungs, creating the characteristic hissing sound Darwin heard. The noise can sound threatening even though it is commonly associated with defensive withdrawal.

Giants of the Galápagos

Galápagos tortoises are among the heaviest tortoises alive today. Fully grown individuals may weigh hundreds of pounds, and their slow movement and immense shells make them some of the archipelago’s most recognizable animals.

Their size was already well known to sailors and settlers before Darwin arrived. Tortoises were unfortunately also taken aboard ships in large numbers because they could survive for long periods without food or water.

Shell Shapes and Island Differences

One of the most important things Darwin heard during his stay was that different islands could have tortoises with different shell shapes. Residents reportedly claimed they could identify a tortoise’s island of origin from its appearance.

Those differences later became significant as Darwin considered the possibility that populations separated geographically might gradually develop different characteristics.

The Galápagos and the History of Evolution

Darwin’s Galápagos visit lasted only a few weeks, but observations made there eventually became famous because of their connection to his later scientific work.

Years after the voyage, Darwin developed his theory of evolution by natural selection. The distinctive animals of the Galápagos became some of the most familiar examples used to illustrate how populations can change in response to different environments.

A Species That Became a Conservation Symbol

The Galápagos giant tortoise later became one of the defining symbols of the islands themselves. Several populations suffered dramatic declines because of hunting, introduced animals and habitat changes.

Conservation programs have since focused heavily on protecting remaining tortoise populations and restoring them to islands where their numbers had been greatly reduced.

Why the Answer Is the Galápagos Giant Tortoise

The combination of details makes the identification clear. The year 1835 corresponds with Darwin’s visit to the Galápagos, the animal weighed more than 200 pounds, and it responded by hissing and pulling its head into its shell.

That makes the Galápagos giant tortoise the correct Final Jeopardy response, connecting a memorable wildlife encounter with one of the most consequential scientific voyages in history.