Questions tagged [mammals]

Questions related to mammals, animals that nurse their young, have a neocortex, and three middle ear bones.

Filter by
Sorted by
Tagged with
2
votes
1answer
114 views

Do beavers' tails hurt from being dragged?

I understand that when beavers walk on land, they drag their tails behind them on the ground. Their tails look quite large and rather heavy, and the ground is often rough - does dragging the tail not ...
3
votes
1answer
47 views

Bats observed hunting insect prey - any evidence of “handedness” (laterality) in circular flight pattern?

Whilst watching a bat hunting on the wing at dusk (most likely was a species common to my urban UK location, e.g. pipistrelle) its flight pattern around the garden comprised circles, several metres in ...
0
votes
1answer
262 views

Black squirrel in France?

I saw a nearly jet black squirrel in ardeche today, carolinensis have invaded the UK and Italy, however I didn't find news about their arrival in France. Was that black squirrel really a Canadian ...
26
votes
1answer
2k views

Specific mechanism behind lethality of yellow coat color in mice

Our high school genetics chapter has some extra information about L.Cuenot. It only covered his research, and the fact that mice homozygous for yellow coat color would die before birth. It was an ...
11
votes
2answers
1k views

Squirrel nest construction

I've often wondered how squirrels -- specifically, eastern grey squirrels (Sciurus carolinensis) make their nests. Specifically, I've been curious about how they "weave" everything together to make ...
2
votes
1answer
102 views

Mystery rodent in Winnipeg

I spotted this rodent in Winnipeg, Manitoba, Canada on September 6, 2020. It is about 10 inches long. What is it?
1
vote
1answer
143 views

What is the animal in Nosferatu movie? [closed]

I was watching Nosferatu, and this dog-like animal appeared, with very curious stripes. I was wondering if this is clearly a specific animal, and which one it is, or if it's too mixed up and low ...
1
vote
0answers
56 views

Why do mammals rarely have eyespots?

An eyespot is a marking to mimic the eyes. Many examples of eyespots can be found in fish, reptiles (including birds), and insects. Recently Radford 2020 has shown that artificial eyespots can reduce ...
0
votes
0answers
21 views

How do naked mole rats suckle when their lips are behind their teeth?

Lips are believed to be needed in mammals so that we can create an ample seal for suckling milk, and while I'm aware they /do/ have lips and can create a seal, they are behind the teeth. How do they ...
1
vote
1answer
388 views

Are there any arboreal mammals which eat leeches?

Are there any tree-dwelling mammals which might be found taking a living leech and eating it? (And do any hollow-dwelling birds of prey eat leeches?)
2
votes
1answer
1k views

What controls the size of breasts?

I am not a biology student, just a curious person. To be specific, I'm talking about female humans. I know that it might apply to other mammals. What controls the size of breasts? I have heard about ...
1
vote
1answer
88 views

Are there known life expectancy differences in non human mammals by sex?

In humans either for biological or cultural reasons there are life expectancy differences by sex. But how about non human mammals? Are there known life expectancy differences in non human mammals by ...
3
votes
0answers
217 views

Which mammal produces the most milk?

I'm searching for the mammal species that can produce the most milk during lactation. I Googled it, but it says dairy cattle which biologically speaking is not right answer, because a baby whale can ...
7
votes
1answer
237 views

What is the biochemistry of love?

How is love induced between humans? Say, between mother and child, couples, etc. Does the phenomenon of love exist in other mammals, too?
1
vote
1answer
21 views

How does a sheep's fleece impact its tolerance for high temperatures?

I am interested in whether a sheep endures more stress when its environment is hot if it has a full fleece or if it is recently shorn. Put another way, at the extremes, is a sheep more likely to die ...
2
votes
1answer
77 views

What about this bat?

This happened in LaGrange GA. We heard some crawling around behind one of the faux-wood shutters on our front porch. So I eased it back and saw this: If you can't make out the scale, the furry part ...
3
votes
1answer
492 views

Why were dinosaur skeletons so light compared to mammal skeletons?

I was watching a presentation by Dr. Jessica Theodor [1] who discusses (at 38:10), among other things, the skeletal structure of dinosaurs vs. mammals. "Dinosaurs have way lighter skeletons, which ...
0
votes
1answer
67 views
0
votes
2answers
482 views

Like Mother Cape Buffalo,do remaining mammal mother species also try to protect their babies from being eaten by predative animals?

Some statistics say that on earth there are approximately 5500 mammal species.I have seen a video of Mother Cape Buffalo protecting it's calf from being eaten by predative animals.Like Mother Cape ...
10
votes
1answer
2k views

How did dolphins acquire their dorsal fin?

I had been thinking bout atavism when I saw a picture of a dolphin. I had seen it before, but suddenly the dorsal fin startled me. How did this dorsal fin evolve? Is it some atavism from eons ago, a ...
0
votes
1answer
30 views

What coronaviruses have been identified in racoon dogs?

Christian Dorsten says in an (Apr 26) interview in the Guardian that racoon dogs as [intermediate] source of coronavirues have been overlooked (in China): Q: What do we know about that intermediate ...
4
votes
2answers
181 views

GULO only for mammals?

I am not a biology student, but just want to know if GULO gene are present only in mammals or all species possess it ? And is GULO gene active in human fetus?
-5
votes
1answer
26 views

In north America is their mammals that can survive from falling from hundreds of feet? [closed]

Like animals have great attributes but is their any mammals that have unique attributes to survive such fate of death?
0
votes
0answers
17 views

Why do flexor and extensor group of lower limb attach on opposite sides in forelimb of mammals?

The flexor and extensor group of the forearm attach on the medial and lateral condyle of the ulna respectively. What is the evolutionary explanation for that? Selected for to favour internal and ...
-4
votes
2answers
115 views

Why animals haven’t yet evolve in 2020? [closed]

In past when I was born like 1990s I notice most animals haven’t evolved in 30yrs. Example cats haven’t gain more muscular body as to be strong to defend themselves from predators like well many ...
5
votes
1answer
142 views

Did my wildlife camera take pictures of coyotes?

A wildlife camera took these photographs of these animals. These are the only pictures my camera collected of them. This picture was taken in the central interior of British Columbia, Canada. The ...
2
votes
1answer
183 views

Are there any mammals in which polyspermy produces viable zygotes?

Are there any mammals in which polyspermy produces viable zygotes? In the wikipedia page it is mentioned that there is a delicate equilibrium between female defenses against many sperms, which ...
10
votes
1answer
3k views

Why do squirrels have twitchy bushy tails?

Whenever I see a squirrel in the woods, it is always the big bushy tail flipping around that gets my attention first. A pray animal with a big bushy flag calling attention to it's self seems to be ...
1
vote
0answers
49 views

Why do some mammals have incomplete orbits?

I've noticed that a lot of carnivorous/omnivorous mammals (most, if not all the members of carnivora and some ancestral cetaceans), as well as some herbivores (marsupials), have incomplete orbits that ...
6
votes
3answers
5k views

What is the difference between the evolution of fins in whales and fish?

For a homework assignment I received the following question: Which statement best explains the evolution of fins in whales and fish? a. The common ancestor of whales and fish possessed genes for ...
3
votes
1answer
39 views

Why are Aardvarks capable of burrowing given their size?

I was wondering if large animals could possibly dig extensive burrows for themselves to live in. The polar bear burrows, but snow is not dirt. The aardvark goes about 4' long, ~150 lbs: similar to a ...
1
vote
1answer
87 views

Why are smaller mammals more prone to cancer and tumors

especially rats and mice usually develop cancer and tumors very fast, reducing their life expectancy. From an evolutionary point of view, how come that these mammals are so prone to cancer and tumors ...
7
votes
1answer
133 views

Are there any animals that are unable to hear the human voice?

Humans and animals have different hearing ranges. The frequency range of a human, for example, is stated with 20 Hz to 20 kHz, whereas the fundamental voice frequency is stated with 125 Hz for men, ...
2
votes
2answers
140 views

Did any warm blooded animals evolve back into cold blooded?

Pretty much as title says - wondering if evolution can go from mammal back to reptile - either in theory or practice.
2
votes
0answers
56 views

Why did the armadillo cross the border?

Armadillos evolved in South America. When the continent was joined with North America, one species - the nine-banded armadillo - spread north into Middle America. Apparently, the armadillo reached ...
6
votes
1answer
3k views

Why does snow not stick to the fur of wolves and some breeds of dogs?

This question made me wonder, why for example wolves don't suffer from these "paw snowballs"? (...) but after a few miles on the trails in soft snow, he often develops snowballs between his paw ...
1
vote
0answers
49 views

Eagles carrying off a goat to its nest: How heavy is the young goat? How strong is the eagle? Here is my guess:

I posted a related question, here, trying to identify the exact subspecies of animals. In the documentary El Hombre y la Tierra, a golden eagle carries off some sort of juvenile(?) goat. The Japanese ...
2
votes
1answer
122 views

What pigment is responsible for the formation of blue skin color in some animals?

Not long ago I read about Vervet monkey. Here's picture: My question is what causes this blue coloration of the scrotum? I don't mean evolutionary need (e.g. attracting females), but what pigment or ...
4
votes
0answers
38 views

Why is there such a long interval between ages of sexual maturity and of reproduction in female chimpanzees?

There seems to be some disagreement on the ages at which female chimpanzees typically reach sexual maturity and when they typically first give birth, but regardless, different sources seem to agree ...
20
votes
2answers
18k views

Evolutionarily, why do male rats and horses lack nipples?

Developmentally male rats don't have nipples because (reddit) Testosterone release in the fetal male rat happens before the stage of mammogenesis where the teat is formed whereas other species halt ...
2
votes
0answers
89 views

Do animals like Seals feel cold on their skin?

Whenever there is a documentary about animals and you get to the colder regions, you will hear about Seals and their layer of blubber keeping them warm. But the skin is on top of the blubber, in ...
2
votes
0answers
51 views

What kind of skull is this-I found it on the beach in Cape May

I am hoping someone can help identify this skull! We found it on the beach in Cape May. The skull size is about 4 inch in length. Thank you.
0
votes
0answers
20 views

Age until physical growth ceases, mammals

Fairly basic, but I am seeking a table showing how many years from birth it takes for the best-known mammals to stop growing. (Including the latest on humans - ie. 0-17..?).
1
vote
1answer
147 views

What are the differences between mammal and insect digestion of cellulose?

I know that digestion of cellulose is difficult in mammals and requires a lot of steps. But I am fascinated by the idea of one day achieving human digestion of cellulose. Which got me thinking about ...
1
vote
1answer
227 views

Do male skunks have teats?

Simple question. Do male skunks (striped skunk, eastern US/Canada if it matters) have teats? Occasionally want to identify road-kill, but don't know if teats are diagnostic for females. I believe ...
0
votes
0answers
54 views

Mammal Statistics about Natural Death Versus Being Killed?

Is there data determining what percentage of mammals die a natural death (disease, old age) and what percentage die due to being killed and/or eaten by other mammals? In watching wildlife ...
19
votes
2answers
5k views

Why is wombat excreta shaped like cubes?

I've heard that wombat excreta is cube shaped, but I don't understand how that can happen. Has anyone studied the phenomenon? What would the evolutionary pressure have been to cause this?
1
vote
0answers
34 views

Are there poisons that affect only mammals but not reptiles

Are there poisons that affect only mammals but not reptiles or crustaceans? E.g. hemotoxins which affect hemoglobin but not hemocyanin or specific Na+ channels? Looking for a "nice" poison/disease as ...
1
vote
1answer
99 views

How exactly does symbolic language for apes work?

I'm talking about the panels with lots of colored symbols on them you sometimes see in documentaries and the like. Apes point at the symbols in a specific order and in this way can communicate with ...
0
votes
1answer
39 views

Limbs in synapsids

Within synapsids, there was a change from a lizard-like sprawling posture (like in pelycosaurs) to a more erect stance. Non-eucynodont eutherapsids seem to have had a facultatively erect hindlimb and ...

1
2 3 4 5