37
The aliens have no game. Human women somehow have the uncanny ability to detect their desperation to mate. Protecting the purity of the human race, one rejection at a time.
23
A human male produces millions of sperm a day, and can have hundreds
or even thousands of children fairly quickly.
Yeah, no. For several reasons, the main one among them being that the number of men in the world (especially the modern world) who, without the aid of technology, could realistically get "hundreds or even thousands" of women pregnant ...
13
Just use Ostriches, why wouldn't you?
they're here.
they're not extinct.
already more or less big enough.
we already farm them in the real world.
they live in flocks which makes herding relatively easy.
their eggs make handy water flasks, bushmen use them as such.
they lay their eggs in a single (convenient for collection) communal nest.
though ...
12
Elephant Bird
Elephant birds are probably your best bet for a large, domesticated avian. They're very large, so they should have a lot of meat on them, and perhaps even more notably they produce very large eggs that have a lot of uses beyond eating. The Malagasy people frequently used elephant bird eggs (both collected while the birds were alive as well as ...
9
TL;DR: Such species already exist.
As @Jonathan already mentioned, most mammals can control their breathing and, to a lesser extent, their heart rate. This doesn't quite qualify for what you're wanting, as there's still an automatic backup to keep the animal from dying.
However, there are some species that do have full control. For example, dolphins and ...
8
From the little I know, I know that humans produce electrical charges to contract muscles
Your premise is wrong.
Electrical pulses in human body do not directly energize muscles, they just carry the signals between the brain and the muscle.
The actual energy source is this molecule, called ATP
Adenosine triphosphate (ATP) is an organic compound and ...
answered Apr 15 at 2:33
7
The simplest answer is that the octopus will be discovered in day-to-day life.
Lets say your human always sleeps late, but one night your human wakes up because he's got the flu and can't sleep, but the octopus in question is still asleep somewhere unable to mindcontrol himself away. That's going to be a discovery right there.
Lets say your human hits ...
7
One of the most obvious reasons for the failure of these ambitious plans is social structures dominating human societies. There are very few males who can spread their seed far and wide. Most human societies, modern and historic, limit sexual interactions for both sexes. And while men have more freedom they still cannot impregnate thousands of women easily.
...
6
There's a better way
The alien spores are complex haploid cells that (like many microorganisms) are hardened against desiccation and ultraviolet light to survive in the upper atmosphere. When humans and other animals breathe them in, they embed in the lungs. There the spores fuse with the human cells. They regulate the activity of the human cells to ...
5
If that can't be done entirely how can we make the bones as lightweight as possible so they can still swim, but get hit by a semi truck and not break a single bone?
You are approaching this from the wrong angle. No matter how hard bones are, a 60-100 kg human will not survive without unbroken bones after being roadkilled by a semi.
Also the problem with ...
4
Fire Hawks and Big Grazers
A couple species of hawk native to Australia intentionally spreads fires as a way to flush out game. The things literally fly around dropping flaming sticks from lightning strikes/other fires into new areas, and would be a great way to encourage grass growth.
Combine that with some sort of large grazer which feeds on grasses and ...
4
Would the Highveld of South Africa suit your purposes?
It has an altitude between 1500 and 2100 meters and its latitude is 27 °S.
It is home to some of the country's most important commercial farming areas, as well as its largest concentration of metropolitan centres
Naturally occurring vegetation in the Highveld consists of different types of well-...
4
without the spells? Several eagles, also some other birds.
Yep, no mutated magic octopus or crazy animal amalgamation This time, just a group of birds. Your droppers can't see what's above them meaning anything that can fly and is capable of delivering high enough damage can wing. All the eagle needs to do is fly up, dive in its blind spot and wound its ...
4
The species just needs to be strictly monogamous. There’s a rule of thumb that the less monogamous a primate species is, the bigger the difference in size and strength between males and females.
To quote Wikipedia:
A strong association between polygynous mating system and dimorphism
in primates has been observed. Monogamous species tend to show lower
degree ...
4
The two main factors would be:
sexual selection;
reproductive success non-dependent on physical strength and body size.
Sexual selection is natural selection based on preferences for sexual partners. It is speculated that sexual selection is the main reason for higher-pitched voice and sub-optimal fat distribution in human females.
Your hypothetical ...
4
humans are already close, there are plenty of species that do not show size differences, you can just say they are the same without explaining it and people will not be able to say anything unless you undermine it with behavior.
You have it backwards a size difference needs to be justified (although not difficult to do) the same size is the default.
As long ...
4
You're basically asking us to be God, but do it better. A reasonable request and good clean fun, but there may be some delays in shipping.
Let's start with the obligatory reference ... enough said. Evolution can do our plot work for us on the ground, but the worldbuilder needs to be creationist.
Boron carbide? Maybe. Take any three elements from B, C, ...
4
A simple option would be that some aspect of the alien mind inhabiting the male human body makes that human male impotent. That would be a significant barrier to the human male spreading their (now) alien genes.
3
The top of my head was chopped off and I'm still moving.
Since everyone has an octopus on their head, the octopuses have agreed they will all have their host believe the extra wobblier top part of their head is completely natural and has always been there. This accounts for all physical ways of discovering the octopus. Of course my hood is extra large -- I ...
3
Droppers are their own predator.
Droppers are fiercely territorial and have no tolerance whatsoever of any incursions by their own kind. If one Dropper sights another a fight will ensue every time as even lesser Droppers consider themselves kings and queens of all they survey. Often these fights are to the death, with the victor then intermittently ...
3
The flu
A creature with one entrance/exit for food, low to the ground when young and only acid against disease. Without further aid from a parent in what is edible or build immunity thanks to breast milk for example they are very vulnerable. Cholera, dysenterie and even the common flu can kill fledglings droppers. Only the strongest survive.
3
YES it is possible to harvest electrical energy from nerve impulses.
NO "significant" would not be a good word to use for the quantity.
"Barely detectable" would be a better description.
The electrical component of nerve impulses is only about 55-70 millivolt, and it is a short duration event lasting at most a second or two, followed by a ...
3
I would answer the question in two manners:
Is it possible for an species which can control autonomic function to exist?
Yes
Is it possible for an naturally evolved species which can control autonomic function to exist?
No, unless you can come up with strong evolutionary or cultural advantage why that would be beneficial and that can't be compensated for ...
3
Efficiency numbers are off
Plants are .1% to 4% efficient at turning incoming energy into plant. So your 26% is much too generous. These numbers are from plant efficiencies for the whole biofuel thing. Granted the life prior to the living planet could have evolved higher efficiency which was then incorporated.
How would exoplanet seeding evolve?
Evolution ...
3
This isn't answering your question, so I apologize, but there's another problem in your invasion plan.
Even if the aliens replaced all the DNA in all of our cells, we would still be us. The cells still need to function and keep up their own metabolisms. So the alien DNA couldn't interfere with any of that. But let's say that it's not removing anything that ...
3
They already exist, if you throw in enough pareidolia.
Amoebas are pretty good at changing the shape of their unicellular body, and it can be happen that they might look, at a certain point, like a human shaped figure, like this photo demonstrates.
3
Simbakubwa kutokaafrika had a carnivore-like build but was 1000 pounds larger than a polar bear.
https://www.youtube.com/watch?v=5BH4hYITdn8
https://markanderschannel.com/big-cats/lion-hyaenodon-bones-found-in-kenya-simbakubwa-kutokaafrika-video/
African lions weigh up to 550 pounds or 250 kilograms. The largest
land carnivore living today on average is ...
3
High Level Adventurers or Monsters
The Torchmaw is stupid-powerful enough to easily destroy a medieval town or forest with impunity. Only high level monsters or adventurers can fight against it.
Here's the catch. The Torchmaw is powerful because its body contains a large amount of Chaos Energy. The same energy that allows things to level up. It's not ...
2
They Can Barely Move
A gorilla is about 6ft tall when fully upright. A smaller gorilla (5ft tall) has muscle fibres 5/6 as thick as the big gorilla. Hence the small guy is 5/6 as strong as the big guy. Say the big guy can pull a 400kg load and push a 150 kg load. The small guy can pull a 333kg load and push a 125kg load.
The problem here is that no one ...
2
You can already control your breathing, just not to a full extent, the reason you can control your breathing but not to the point of being able to stop breathing forever is that it's an autonomous function that works subconsciously, and your subconscious decisions, putting it in a simple way, have priority over your conscious ones,especially since breathing ...
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