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Questions tagged [mammals]

For questions about mammals as they evolved on Earth. This may include, but is not limited to, warm-bloodedness, the possession of fur, the ability to secrete milk, and the bearing of live young.

15
votes
6answers
5k views

How could a female member of a species produce eggs unto death?

As far as I am aware, female mammals cannot produce eggs (as in ova) after a certain age/maturation. How could the female produce eggs for an unlimited amount of time, resulting in a 'queen' mammal ...
13
votes
7answers
2k views

Would it be possible for mammals to evolve blue blood?

Ever since I found out about the green blooded skink, I have wondered if it's possible for other blood colours to evolve among vertebrates, specifically blue in mammals.
13
votes
2answers
415 views

How plausible would a fully aquatic bat be?

So, it turns out that bats are actually pretty good swimmers; several species of bats have been reported swimming, and they're far more capable and agile in the water than they are on land: https://...
11
votes
3answers
2k views

What evolutionary factors can contribute to large sexual dimorphism in large mammals?

On Earth, the polar bear is among the most sexually dimorphic animals, with males being on average almost twice as heavy as females (Wikipedia claims average weights of 450 kg for males versus 260 kg ...
9
votes
4answers
450 views

Could a cow produce bottled milk?

Could a cow produce bottled milk? The answer is, of course, no; there is no way a cow could do that; obviously. Perhaps I should be more clear on what I'm asking. Is there any way a mammalian ...
9
votes
5answers
567 views

Hippotragine Antelopes: A Suitable Alternative For Actual Horses?

The hippotragines are a small subfamily of antelopes that bear physical resemblance to horses. There are three separate genera--Hippotragus, Oryx and Addax. As grazers, rather than browsers, the "...
7
votes
2answers
219 views

What circumstances would ensure that hybrid species of frankencats are produced in the wild naturally?

I am a mad scientist with an intelligence matching Albert Einstein and Steven Hawking, and plan to create a new species of animal. After watching Napeoleon Dynanite, widely considered by critics to be ...
6
votes
8answers
250 views

Could a medium sized mammal in the order carnivora evolve to be bipedal?

In the movie Guardians of the Galaxy (and a few others), we meet a bipedal raccoon known as Rocket (who I am aware did not evolve to be bipedal, but I am using him as an example). I honestly love the ...
6
votes
1answer
202 views

How could a mammal develop that has long legs but lives in a semi aquatic area?

This probably sounds fairly ridiculous- I know, but in short I've been developing a sort of future earth. It's not extraordinarily accurate, but I've been trying to at least keep the obvious in check. ...
6
votes
2answers
259 views

Oogenesis similar to spermatogenesis

I think I have found a biological solution to prevent menopause. My Kepler Bb humanoids don't get more frail with old age so aging is not a cause of death for them. They can survive well past 100 ...
5
votes
3answers
539 views

An Australia for Egg-Layers (No Marsupials)

Without a doubt, the most iconic mammals of Australia are the pouch-bearing marsupials. You can find less than 250 species in that one island-continent. Marsupials have been around for 65 million ...
4
votes
2answers
362 views

How powerful a bow would be needed to kill this lion

In this land, similar to late medieval Europe/North Africa, there are a species of very large lions, a little larger than the prehistoric American Lion, with an average weight of 500 to 600 kg, that ...
4
votes
4answers
111 views

Three-Toed Sloths in Temperate USA

Bradypodidae is the family consisting of the three-toed sloths, the one we most associate the word "sloth" with. As far as we know, they exist only in the tropical forests of Latin America and never ...
3
votes
4answers
164 views

Megatherium tool making

I have seen many questions and answers throughout this site, and as far I have understood, thumbs are not needed to use tools. Seems like many structures and objects can be used properly with any kind ...
2
votes
4answers
174 views

Which Modern Mammals Would Die Out in an Alternate Extinction Event 5 Million Years Ago? [closed]

Five million years ago, a progressive downward slope in the global climate put an end to the Miocene Epoch and brought on the Pliocene Epoch. To get a visual idea, since we humans are a visual ...
2
votes
2answers
138 views

Adjusting from Quadruped to Biped [closed]

You are a intelligent adult quadruped; suddenly, you find yourself in a humanoid body due to magic! How long does it take you to learn how to move in your new body? Imagine a race of sapient ...
2
votes
2answers
278 views

Egg pouch: Chest or Abdomen? [closed]

My aliens in my generation ship story are reptilian with some mammal characteristics. They have 2 hands, each of which has 6 fingers. 2 of those fingers are thumbs and the thumbs are on opposite ...
1
vote
3answers
139 views

Whale-Tail and Seal-Legs in One Animal

In marine mammals, there are two different body types for two different niches: A long, strong tail for all-marine whales... ...and all four legs modified into flippers for pinnipeds that feed in ...
1
vote
5answers
211 views

Can Pinnipeds Fit in a Worm Forest?

In an alternate Earth, coral has been extinct for over 400 million years. In their place were the following: Bivalvia (clams, oysters, mussels) Cirripedia (barnacles) Canalipalpata (bristle-foot or ...
1
vote
1answer
215 views

Gorilla + Orangutan = The Best of Both Worlds

In the great apes, there are two worlds--ground and treetop. Representing the ground is the largest primate on Earth, the genus Gorilla. Representing the treetops is genus Pongo, the orangutan. ...
1
vote
4answers
275 views

Bats With Pterosaur Wings

Perhaps THE hallmark of bat anatomy is the wing--a thin sheet of membranous skin attaching four of five fingers. But compared to another group of skin-winged fliers, that's pretty much it. According ...
1
vote
1answer
121 views

Humanity Without STIs [closed]

In the history of disease, ranking high among the list of most deadly are the rogues gallery of sexually transmitted infections--syphilis, genital herpes, chlamydia, gonorrhea, HIV and especially AIDS....
1
vote
2answers
143 views

A monkey-like creature with no legs?

Is it possible that a monkey-like creature, in the mountains, could evolve to have no legs and a really strong set of fore-arms? I was thinking that this might be possible because of the climbing ...
-1
votes
1answer
539 views

If Mermaids Were Sea Lions Instead of Fish [closed]

The most popular image of the mermaid is a half-girl, half-fish beauty. Biologically, physiologically and evolutionarily, this sort of mixing is 0% compatible. I'm also not going for the half-girl, ...
-2
votes
2answers
216 views

I want to steal a dolphin from captivity and release him in open water. What do I need to know? [closed]

I don't actually want to do this, but I'm writing a story and I'd like it to be scientifically accurate. A marine biologist will be doing the heist, so any advanced and cool knowledge is welcome.
-3
votes
3answers
201 views

Is the evolution of my aliens realistic?

So, I have thought about the evolution of my aliens and how they could evolve things like lactation but still retain their reptilian characteristics. Here is my best thought about it so far: ...