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For questions about living things. Does not exclude aliens, but additional information is usually necessary (consider using "xenobiology" instead).

5 votes
2 answers
173 views

anatomy of a head-butting cyclops

In my fantasy setting, cyclopses are large (about the size of a rhinocerus), carnivorous humanoids. They have a single blunt horn on their forehead, which is their primary tool for taking down prey. T …
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9 votes
2 answers
2k views

How do wraiths control their bodies?

In my fantasy world, wraiths are a species of shell-less, regressed crustaceans. They lay their eggs inside animal skulls, using them as shells. The wraiths' bodies are incredibly weak and they cannot …
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4 votes
5 answers
521 views

The anatomy of an organic microwave generator

I have a concept for a species of arctic-dwelling organism (let’s just call it a polar bear) that evolved an organ that was able to produce microwaves, which it uses to tunnel through ice. If such a …
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  • 2,828
10 votes
10 answers
5k views

How big would the brain of an omnipresent being be?

There is a being who has been alive for as long as there has been life on earth. It has the ability to anomalously produce matter from its body out of nothing. Through the production of microfine stra …
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  • 2,828
1 vote

Physical correctness of trolls with high regeneration ability

perhaps you could explain it with some of their cellular structure breaking down into liquid, then travelling to the site of the wound and reorganizing to repair it. This would be a good way to explai …
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  • 2,828
43 votes
14 answers
5k views

How would predation work in an empathic universe?

In my world, there is a plane of existence whose laws of reality work differently than ours. In this plane, thoughts are not private. The boundaries between the mind and reality are slim, and thus eve …
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  • 2,828
46 votes
12 answers
12k views

Is there an evolutionary advantage to having two heads?

This is a classic of fantasy/sci-fi stories. A creature with two heads, two brains, two distinct personalities, sharing a single body. An entire race of Siamese twins. But the question is, what enviro …
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  • 2,828
7 votes
2 answers
225 views

How can an amorphous creature change viscocity at will?

In my fantasy setting, slimes are a species of giant (about eight cubic feet), single-celled amoeba. They have the ability to freely change their state and viscocity, being able to "melt" into a slurp …
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  • 2,828
10 votes
4 answers
977 views

How big could a land-dwelling arthropod get if it wasn’t limited by oxygen consumption?

Insects and other land-based Arthropoda are stuck at the size they are due to how inefficient their respiratory system is. They were able to reach the size they did in the Carboniferous period because …
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  • 2,828
9 votes
4 answers
1k views

Is a reptile with diamond scales possible?

I thought of a concept for a dragon or similarly gigantic reptile with a special adaptation, in which they’re born with scales made almost entirely of carbon. Then, over an incredibly long life cycle, …
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  • 2,828
4 votes
4 answers
239 views

Internal chemistry of a melon bomb

I am a giant, intelligent, fortress-like, plant-based organism, able to forge many structures, defenses and organisms from my flesh by altering my own DNA and rapidly growing new constructs whenever a …
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3 votes
3 answers
562 views

Is it possible to create an organism that is completely immune to radiation?

Radiation is the ultimate bane of all organic life. Its particles punch holes in our DNA, causing mutations and giving us cancer. But, is there a way to make an organism that is unable to get radiatio …
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1 vote
1 answer
122 views

Is it possible for a naturally-evolved organism to feed on kinetic energy? [duplicate]

Is this even possible with our current understanding of molecular biology, and if so, would it at all be an effective method for obtaining energy? …
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