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For questions about living things. Does not exclude aliens, but additional information is usually necessary (consider using "xenobiology" instead).
4,294 questions
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What is the maximum sustainable population of an all-female species that relies on monogamous human men to reproduce?
In my fantasy setting, there's an all-female humanoid species called Venusians. They are massive, pink-skinned warrior women with pointed ears. Venusians are significantly stronger, faster, and more ...
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Is an animal quintuple sex species feasible? [closed]
In my world, there is a species of chimerical beings that are one fourth arthropod, one fourth platyhelminth, one fourth mollusk, and one fourth chordate. They are naturally called ...
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Thermodynamics of extremely rapid growth in large/complex animals
Background
In a mostly hard sci fi setting, I have chosen to include a large (Elephant sized), warm blooded species capable of highly rapid growth as a defence mechanism to long term stress, doubling ...
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are there any theoretical alterations (whether genetic or mechanical implants) that could be made to the human lungs to suit thinner atmosphere?
I have concepts of a new frontier sort of world, post evacuation of earth/solar system (I've already been able to jump through a few of the logical hoops necessary for such an event to happen), and ...
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Organic monomers and macro-molecules for silicon-based life?
While silicon based life form are entirely speculative, and it's still up for debate if it even could exist, much less whether it does, I wanted to ask if there has been any informed speculation about ...
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Ideal bilateral pentapod bodyplan [closed]
I've been breaking my head over how I want to undertake the basal bodyplan on my hard science world. I've settled on 5 legs, but don't exactly know which would be the most stable, or realistic.
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4
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Best way for floating jellyfish to be deactivated?
The buoyfish is a very common type of animal. It is basically a jellyfish but it flies. Inside there is a hydrogen reservoir filled by bacteria making the gas. The buoyfish has air bladders to use as ...
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How would the muscular and bone system of a insectoid-human hybrid work? [closed]
I was wondering on this idea for quite some time now, as I would like to know how factible it would be to have this sub-species on the earth; in my idea they would get different characteristics from ...
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The biology of hybridized scale-feathers
Years ago, I wanted to create a species that ‘evolved rapidly’ and therefore possessed as many evolutionary advantages as I could think of. Recognizing that my idea wasn’t the most original, I wanted ...
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Can a tetrapod grow based on an external framework?
In my world, I am working on designing an organism that develops large wings as it grows to adulthood. These wings are formed from woody structures acting as a framework, grown by a symbiotic fungus(I'...
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What is the maximum size of a gliding animal?
In the past many questions have been asked about powered flight. I am not interested in that. I would like to know what is the theoretical maximum size of an animal with Earth-like biology, possessing ...
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What would I call a human “litter”? [closed]
So I have a humanoid race that gives birth to 7-12 kids at a time. What would I call this? I call it a litter in my head but that’s for non-human animals and it would be very weird for humanoids. If ...
3
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4
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How to ensure my giants remain undiscovered in the modern day?
My giants are around 2.7 meters tall, weigh ~240 kg, and have intelligence similar to a capuchin monkey. They are omnivorous mammals and take a digitigrade stance, with a stiff tail to support ...
- 3,108
2
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3
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How can a human have both a cat-like flexible spine and maintain stability?
I have a group of people living in my fictional world who have some of the traits of cats (ignore how this happened). These traits include a spine with shorter vertebrae and longer intervertebral ...
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4
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How might sapient elephants overcome their poor vision?
This is a part 4 to a series. See 1, 2, 3.
In my Napoleonic-era world, there is a race of sapient elephants resembling Asian elephants but with a more dextrous trunk. They are in conflict with human ...
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