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.

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7
votes
2answers
297 views

What If Kangaroos Became An Invasive Species In Eastern North America?

What if kangaroos (specifically eastern grey kangaroos) became invasive in the eastern part of North America? How would they effect native flora and fauna? What would they compete for resources with? ...
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2answers
108 views

What would mammalian dinosaurs look like? [closed]

Here's a crazy idea: What if there were mammals that were designed similarly to dinosaurs? Similar proportions, similar accessories, maybe even similar size... I was thinking of species to add to my ...
3
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1answer
154 views

How Would the Multituberculates Survive Longer Than in Our Timeline?

In exploring likely candidates for an alternate Earth without rodents, someone suggested multituberculates to me. Here's a little summary as to who the multituberculates were for anyone not in the ...
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1answer
91 views

Ivory Headgear--Likely or Not?

My apologies for not giving you a larger image, but it does show you a compare-and-contrast on what horn is in comparison to what antler is. Basically, it's just a piece of bone covered in softer ...
2
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3answers
110 views

How Would a Merpanther Hunt?

Allow me to present the Brethmechin, a creature of Indonesian mythology. The Book of Creatures website has drawn it as some kind of felid that has adapted for complete marine hunting, rather like the ...
3
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3answers
65 views

Would a Longer PETM Save the Creodonts and the Mesonychians?

Some 55.8 million years ago, Earth underwent a really dramatic heat wave known as the Paleocene-Eocene Thermal Maximum, or PETM. What happened, exactly? We don't know how it happened, but we do know ...
4
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1answer
95 views

Could Meridiungulates Colonize The World Before the Opening of Panama?

The last time I asked something similar, I asked if it would be possible for xenarthran mammals (armadillos, sloths and anteaters) to be thrown off of South America from life-giving rafts to other ...
2
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2answers
53 views

Could an Ice Age Extinction Wipe Out All Marsupials?

Say the word "Australia", and one of the first things to come to your mind would be the marsupials. Of the 334 species of pouched mammals whose earliest ancestors witnessed the fall of the dinosaur ...
4
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2answers
83 views

The Serina Series: Episode I: Cats

"Serina" is a popular speculative evolution project in which, apart from a long list of fish, invertebrates and plants, the only terrestrial chordate to colonize this terraformed moon is the canary. ...
10
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3answers
2k views

Could Cats Add Lots of Plants to Their Diet?

Because nature is never straightforward, there are different levels of carnivores. On the lowest rung of the ladder are the hypocarnivores, in which meat can't take any more than 30% of their caloric ...
3
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2answers
106 views

Would the Muroid Niche Be Occupied by Just One Clade?

The muroids are a superfamily of rodents consisting today of mice, rats, voles, hamsters, lemmings and gerbils. There are at least 1750 different species of them, proof apparent of their ...
23
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11answers
5k views

The Red-Headed Whale. Why Would the Head be Red?

In the waters of Iceland, the natives have their own word for a particular brand of cetaceans--"Illhveli", literally "evil whales". And the bloodthirstiest of them all is ...
2
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3answers
124 views

Mammal evolving spider-silk

I wanted to include a spider-like race in my book (not a typical drider, but more like a hairy hominid covered in tarantula-like hair and thinner and longer limbs and fingers). However, I wanted them ...
3
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4answers
224 views

The Fate of Marsupials in a More Southerly Australia

For the longest time, Australia and Antarctica were one and the same. It wouldn't be until 30 million years ago that Australia broke up from Antarctica. Nowadays, the distance between Australia and ...
6
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2answers
136 views

Perissodactylian Cetaceans

Perissodactyla is an order of mammals consisting currently of the seventeen species of horses, rhinoceroses and tapirs. Usually, any clade is connected by a coupling of genetics and physical ...
11
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7answers
677 views

Can an insect evolve to look and function like a mammal?

I'm working with this alien race that looks and functions essentially like a mammal - skin, muscles, hair, internal bones, large size, etc. - but evolved from an insect or other bug. They're a large, ...
6
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1answer
248 views

Could Bear-Dogs Look and Act Like Actual Bears?

Back home, Amphicyonidae (bear-dogs) predated Ursidae by only four million years. While the latter still lives in the form of eight species, the former had been extinct for two-and-a-half million ...
12
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15answers
4k views

If I have an Earth-like world with Earth-like fauna, and I want brightly-colored mammals, what would be a realistic way of causing that to evolve?

On Earth, while birds and reptiles can be quite brightly colored, it's rare for mammals to have any bright colors, and the rare times they do, it's either just slightly different (like with orangutans)...
4
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2answers
199 views

Can a Mammal Develop a Jaw Shaped Like a Beak?

Many mythological creatures have a popularity secondary only to the dragon (the one true global force.) Among them is the griffin, a half-bird-half-cat cut-and-paste. Now, in an alternate Earth, the ...
4
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3answers
131 views

Wolves and Hyenas--Allies For Life

In recent years, we have found evidence in the Negev Desert of the Middle East of a striped hyena, a solitary carnivoran, tagging along with a pack of wolves. This sort of alliance is found nowhere ...
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3answers
131 views

Pinniped Creodonts

Here is all you need to know about the creodonts: They were a group of carnivorous mammals that, despite having carnassials, had no relation to Carnivora. They were a global force, occupying ...
2
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2answers
89 views

Can Owl Ears Instead of Echolocation Guarantee Life in Cave Colonies?

In an alternate Earth, there are no bats. Instead, there are "flying monkeys" (which are actually lemuriform primates, rather like bushbabies or lorises.) And even though they have batlike ears, ...
7
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3answers
2k views

Can an animal produce milk all the time?

So as most of you probably know, cows don't produce milk all year round for no reason, they need to be pregnant and then you gotta do something with the calves… Now in my story that has an ecosystem ...
23
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4answers
2k views

What is the bio-mechanical plausibility of a fox with venomous fangs?

For context, I've been working on a fantasy race for use in a science fiction novel, the gist of which is essentially a red fox that has had its genes manipulated by a supernatural force with the ...
2
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5answers
363 views

Can a mammal and Oviparous have child together if they have similar external body structure?

There are two humanoid races are in my fantasy story. Race A is almost like humans, except they are in super human size, have super human strength, have a higher body temperature etc. Some sort of ...
7
votes
3answers
282 views

Are pharyngeal and cutaneous breathing possible for an aquatic mammal?

I'm working on a setting with merfolk that I'd prefer to be fully mammalian. However, they have underwater cities and I find that hard to believe for a species that needs to surface every few hours ...
0
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4answers
375 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: ...
6
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3answers
330 views

How to produce milk that's similar to blood?

How could a mammal produce milk which resembles blood? The blood milk should keep as many properties of milk as possible, curding for example, while resembling blood as much as possible. The mammal ...
9
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2answers
606 views

Anatomically Correct Swarm of Rodents

Rats are commonly associated with illness and disease due to the role they played in The Black Death. However, some works of fiction portray rats as carnivorous swarms, devouring people ...
9
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2answers
174 views

Could Xenarthrans Be Ferried Outside South America?

Right from the beginning, the xenarthrans--armadillos, sloths and anteaters--have been at a disadvantage. For the longest time, their home was an island continent, which made them extremely ...
3
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11answers
2k views

Bovinae immune to predators

Given an unlimited time to evolve: what are the best ways to make any wild bovinae immune to its natural predators like the classic big felines (lions or tigers) and most reptiles (crocodiles or ...
6
votes
8answers
322 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 ...
2
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4answers
254 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 ...
15
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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 ...
7
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2answers
277 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 ...
9
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5answers
646 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 "...
13
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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.
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3answers
247 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 ...
-2
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2answers
239 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.
4
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2answers
931 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 ...
10
votes
4answers
526 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 ...
13
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2answers
896 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://...
1
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5answers
253 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 ...
2
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2answers
167 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 ...
6
votes
1answer
264 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. ...
3
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4answers
186 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 ...
1
vote
4answers
317 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
317 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. ...
5
votes
2answers
349 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 ...
3
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4answers
130 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 ...