Tetrapod

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"The first animals emerge from the ocean and start living on dry land."

Tetrapod
Habitat	Land
Type	Life
Generator Stats
Base Cost	Entropy 1.65 E8
Base Production	Entropy 76,136/sec
Requires	Lungfish Cold Blooded
Chronology
Previous	Fish
Next	Mammal Reptiles: Turtle Lizard Snake Crocodilia Birds: Galliformes Anseriformes Palaeognathae Neoaves Amphibian

Tetrapod is the 9th Life and the 1st Land generator obtained in the Primary Simulation's Main Tree, which can generate Entropy Entropy. Tetrapods include any vertebrates that are not considered fish, belonging in the superclass Tetrapoda. Tetrapods include amphibians, reptiles, birds, and mammals.

Design

Previously, the generator Tetrapod was named Reptile. However, this changed to Tetrapod in a later update. The tetrapod has three trophy animals, all stemming from the Rise of Reptiles update in Summer 2020.

Tetrapod

The tetrapod resembles a primeval amphibian. A large group of tetrapods swim inside a river in the savanna section of the Land garden, next to the hippo (Ungulates). rhinos (Ungulates), Crocodiles, and the Turtles. Two more rest along the riverside, close to the echidna (Monotremes), and the ducks (Anseriformes). The tetrapod animation is mostly consisted of them opening their mouths and wagging their tails. The creature specifically is unknown, but it most likely resembles a stem tetrapod that is now extinct, so there's a chance that it is a Hynerpeton. When clicked, the tetrapods make low "hooh" sound.

Original Tetrapod

The Original Tetrapod can be purchased for Augmentations Console 10 in the Augmentations Console, which is one of the cheapest items in the entire store. It represents the previous look of the generator before the Land Garden was updated. It looked like a green lizard. For the Reptile, it is now a trophy animal stemming from Tetrapod.

Reptile

The lizard strides near the rainfall.

The reptile resembles a type of large lizard, or a gecko. Two of this creature walk on each side of the small mountain stream in the savanna, next to the waterfall near the lions (Feliform). Another solitary reptile strides in the forest near the ostriches (Palaeognathae) and the kangaroos (Marsupials). Two more reside in the Darwin Island. The reptile has a walking animation.

The lizards makes a clicking sound, like a gecko.

Archosauria

Archie's fossils in the Land Garden.

The archosaur resemble a pink creature somewhat similar to the labyrinthodonts 300 million years ago or a Prestosuchus which lived during the Triassic period. It does not appear in the main garden, but Archie the Archosaur's fossilized remains lay in the hilly savanna region, behind the elephant. The archosaur has a walking animation similar to the reptile's, but slower.

Archie also appears suited and next to a podium in the Mesozoic Valley, with the Tyrannosaurus Rex on the first place, Spinosaurus on second place, and the Archaeopteryx on the third place, which is a reference to the community competition of Mesozoic Mania in which voters vote on their favourite dinosaurs. More archosaurs walk on a line next to the river, as well as a solitary archosaur walking on the same line, but not in the group.

The archosauria makes a pig-like sound when clicked on.

Seagull flies through the Arctic region of the Land garden.

The seagull in the Civilization garden, with a camel caravan on "The Silk Road" across a stone bridge behind it.

Birds

"Birds, not lizards, are the closest descendants of dinosaurs in the modern world. What a plot twist." ― System Log

The birds resemble three seagulls, likely of the genus Larus, flying in a V-pattern. Two seagulls fly around the savanna region; another one circles through the Arctic region; and two more fly through the plains and forest regions, flying through trees. In the Civilization garden, six different seagulls circle the Generators around the Age of Exploration tower. The bird has a flying animation of seagulls in a group of three.

They are silent when clicked on.

The Red-footed booby (Sula sula) is a booby and is the only type in the game. It flies a different course than the other birds.

Red-footed Booby

This bird resemble a red-footed booby (Sula sula) and it flies at a different path than the other birds. Several more reside on Darwin Island. They are tan-coloured with blue beaks, and as the name suggests, red feet. Clicking on them prompts the Achievement Bird of Paradise. More on the achievement tab below. Another booby is located in the Civilization garden, and it also flies through the outskirts of the garden.

Description

"The original colonizers, tetrapods were the first water dwellers to develop legs and amphibious breathing and to crawl onto dry land."

Upgrades

Tetrapod has 27 upgrades, increasing the generator efficiency with a total x1.99022e10 multiplier. But most upgrades likely won't be very useful as by the time it is maxed out, the Neoaves would be already pumping out Entropy in the 30-38th magnitudes of 10, massively overtaking the Tetrapod.

Icon	Name	Description	Cost	Efficiency	Requires
	Lungs	Evolving from swim bladders in fish, the gas-filled bladders called lungs gave tetrapods the ability to breathe air, and the means to function on land.	Entropy 1.7e8	75%	Lungfish Tetrapod
	Warm-Blooded	Warm-blooded organisms have the ability to maintain a body temperature higher than their environments, enabling them to move to new and more diverse homes.	Entropy 1.7e8	20%	Tetrapod
	Legs	Legs evolve from fins to fulfill an organisms' need to support their body weight—a trait essential for migrating from the oceans onto dry land.	Entropy 2.38e8	50%	Tetrapod Fins
	Ear	A refined version of an organism's ability to sense vibrations in the air, ears allows creatures to hear when a potential predator is sneaking up on them—or when their prey is trying to escape.	Entropy 4.84e8	75%	15 Tetrapod
	Scaled Epidermis	Thick, tough skin covered in scales allows the reptiles to live on land without needing to return to the water periodically to survive. Amphibians lack this advantage, which led reptiles to become the dominant species on land for millennia.	Entropy 8.7e8	60%	Tetrapod Mesozoic Valley Rank 3
	Quadrupedalism	Animals that stand and walk on four legs are called quadrupeds. This adaptation requires strong joints, and allows animals to stand farther from the ground and travel greater distances.	Entropy 2.38e9	30%	Legs
	Reptile	Modern reptiles can trace their roots back to the early archosaurs. While they are a shadow of their former selves, they still carry some of their ancient ancestor's traits.	Entropy 4.66e9	50%	Egg Shell Scaled Epidermis
	Shells	Growing out of their ribs and acting as a shield, a turtle's shell helps to protect their body from accidents and predators.	Entropy 1.4e10	80%	Reptile
	Beaks	Inside of their bony beaks, turtles eat using a combination of horny ridges (which are believed to have replaced their teeth around 150 million years ago) and strong jaws.	Entropy 2.8e10	100%	Reptile
	Water-Tight Epidermis	Scales and water-proof skin help reptiles to walk on land, freeing them from the constant threat of dehydration that plagues amphibians.	Entropy 2.12e12	100%	Lungfish 50 Tetrapod
	Archosauria	Archosaurs were the ancestors of dinosaurs, and eventually evolved into birds and crocodilia. By tracing the lineage of these modern animals back to the archosaurs, we can follow the path of evolution all the way back to the Triassic era.	Entropy 8.42e12	90%	Reptile Mesozoic Valley Rank 6
	Protruding Nostrils	Crocodilians have nostrils that sit on the top of their snouts. They stay above water when the crocodilian submerges itself while hunting, so they can continue to breathe.	Entropy 1.7e13	75%	Archosauria
	Sensitive Hearing	Crocodilians have very sharp hearing. Special muscles help to protect their eardrums while they are underwater, making their hearing just as good above or below the surface.	Entropy 3.2e13	200%	Protruding Nostrils
	Ecdysis	When a reptile outgrows its old skin, it must shed it so that it can continue to grow. After the old, dry skin has been shed, the reptile will eat it to gain valuable nutrients.	Entropy 2.3e15	130%	Egg Shell 100 Tetrapod
	Squamates	Squamates make up the largest order of reptiles. They are notable for their scaly skin and flexible skull bones. They are the second largest order of vertebrates on the planet.	Entropy 3.7e15	75%	Reptile Mesozoic Valley Rank 10
	Tough Skin	Lizards have tough, leathery skin covered in scales which enables them to survive in harsh environments, such as the desert. They regularly shed their skin as they grow.	Entropy 6.92e16	150%	Squamates
	Miniaturization	The transition from dinosaurs to birds was marked most by the shift from theropods with large bodies to small bodies. This smaller size allowed them to fly more efficiently, and opened up new habitats and sources of food.	Entropy 9.14e18	25%	Archosauria Mesozoic Valley Rank 23
	Beaks	Birds beaks are strikingly diverse and are key to the variety of types of birds. These specialized tools allow birds to perform a wide range of functions, from preying on fish and mammals to pecking at seeds.	Entropy 2.11e19	25%	Miniaturization
	Limbless	Modern snakes have no limbs. However, some species have vestigial bones from hind limbs that may once have existed before receding.	Entropy 4.06e19	250%	Squamates Mesozoic Valley Rank 15
	Bird	Modern birds have much in common with their dinosaur ancestors, including hollow bones, brooding of eggs, and feathers.	Entropy 4.31e19	350%	Beaks
	Mobile Jaws	Snakes are able to swallow prey that are far larger than the snake's head. This is because their skulls contain extra joints, which allow them to open the mouths extremely wide.	Entropy 7.23e19	300%	Squamates Mesozoic Valley Rank 15
	Running	Most galliformes are not skilled at flying, and some are unable to fly at all. Instead, they have evolved to be quick runners, a skill that they use to escape from predators.	Entropy 2.54e20	450%	Bird
	Game Birds	Galliformes are often domesticated by humans, and have long been used for their meat and eggs, as well as for recreational hunting.	Entropy 5.74e20	400%	Bird
	Male Incubation	The female bird incubates the eggs in most species, sitting on them until they hatch. But in these species, the male does the sitting.	Entropy 1.11e22	550%	Bird Mesozoic Valley Rank 33
	Aquatic Adaptation	These birds have adapted for life in an aquatic environment. They are masters of swimming and eat a diet of fish, krill, and aquatic plants.	Entropy 3.7e22	550%	Long Necks
	Flightless	These birds have wings, but they do not use them to fly. Reduced to vestigial limbs, these wings are just for show.	Entropy 2.22e23	600%	Male Incubation
	Raptor Ancestry	One of the families of neoaves is the raptors—predatory birds like hawks and eagles. It's believed that nearly all modern landbirds, a large bulk of the neoaves, descended from a common raptor ancestor that transitioned from a carnivorous to an omnivorous diet.	Entropy 7.77e24	100%	Bird Mesozoic Valley Rank 38

Achievements

Icon	Name	Description	Requires
	Icy Iguanas, Cold Chameleons	Reptiles are found on every continent except Antarctica.	50 Tetrapod
	Our Scaly Friends	Less than a third of the world's snakes are venomous, and of those only 30—40 species out of nearly 3,000 are harmful to humans.	100 Tetrapod
	Quite a Mouthful	Due to snake's ability to open their mouths extremely wide, the common garter snake can swallow a frog nearly twice the size of its head.	250 Tetrapod
	Have a Heart	Lizards have three-chambered hearts. In contrast, fish and amphibians' hearts only have two chambers, while mammals' hearts have four chambers.	500 Tetrapod
	Slow and Steady	The Aldabra tortoise can live for over 250 years.	1000 Tetrapod

Trivia

The old Tetrapod model.

• According to the game, tetrapods were the first water dwellers to crawl to dry land. However, in real life, bacteria, plants, fungus, and arthropods all were on land prior to any vertebrates.
• This generator used to be called Reptile and had a different model, which you can get as a cosmetic in the Augmentations Console.