Skip to main content

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
0 votes
1 answer
54 views

Why do damaged joints or ligaments experience inflammation? Why do physiotherapists try to stop inflammation as part of the healing process?

I have had the repeated experience of going to physiotherapists with injuries to ligaments or joints and they all expressly aim to reduce inflammation. I don’t understand this. Our mammalian (and ...
6 votes
2 answers
460 views

Can mammals and/or birds see / detect infra-red light?

Wondering if there is any evidence that mammals or birds eyes can detect light emitted in the infra-red? The reason I'm asking relates to the use of nest cameras to detect predators, using infra red ...
2 votes
0 answers
51 views

How do Addax defend itself from predators?

The addax (Addax nasomaculatus) is a critically endangered antelope adapted to live in extreme desert conditions. It has long impressive horns that can potentially serve as a weapon because they are ...
1 vote
0 answers
56 views

Is there any evidence that mammalian ears can act as thermal receptors?

Some snakes have a "pit organ" capable of sensing infrared radiation. The structure is similar to a primitive pit eye. Snakes are cold-blooded and their prey is generally warm-blooded, so it ...
4 votes
0 answers
75 views

Has there ever been a recorded incident of mule deer bucks raising fawns?

I live in Colorado Springs, Colorado. According to Colorado Parks and Wildlife, there are two species of deer in CO, mule deer, and white-tailed deer. According to CPW: There are two species of deer ...
1 vote
1 answer
194 views

Why are beavers not considered marine mammals?

They spend a lot of their lives in the water, they have fur, give live birth, have mammary glands etc...but my teacher mentioned that beavers have continually growing teeth (incisors) which supposedly ...
11 votes
2 answers
2k views

Does interspecies breastfeeding occur in the wild?

Does interspecies breastfeeding occur in the wild? Say, for example, a zebra feeding a wildebeest, or a bushbuck feeding a gazelle. There is a Wikipedia page on this topic but it only shows animal-...
2 votes
0 answers
34 views

Is this scenario allopatric or sympatric speciation?

I stumbled over a speciation scenario but I am not able to say to which type it belongs. I guess for people more familiar with the theory it might be easy to tell. I was reading about the fin whale (...
1 vote
0 answers
87 views

Why have mammalian predators been so small compared to their prey compared to theropod dinosaur predators?

So this is different than the question of "why are megafaunal mammals smaller than dinosaurs", which I understand to be a combination of: live birth limiting size (even sauropods had ...
0 votes
1 answer
153 views

Has a primate species ever weighed the average mass of a tonne (1000 kg)?

I ask because primates are mammals from the euarchontoglires superorder. Most mammals that weigh a tonne are laurasiatherians (except for elephantids and their ancestors) (elephantids are afrotherians)...
0 votes
0 answers
362 views

Mammal size and capillary wall thickness

How does capillary wall thickness vary with the size of the animal? Background/context of question: Of the following, Figure 1 is most consistent with the fact that, in general, smaller mammals have:...
4 votes
2 answers
7k views

Why does the kidney of a cow have lobules, why the kidney of a human hasn't any?

The kidney of a cow has lobules, while the kidney of a human hasn't any. I can't think of any reason why it would be good for a kidney to have lobules. It would be good if the kidney needed to have a ...
2 votes
1 answer
95 views

Are animal whiskers a useful monitoring tool?

I have come across studies that have used stable isotope values from seal/sea lion whiskers to infer foraging ecology. However, I am also aware that whiskers can fall off and then grow back. Is there ...
2 votes
2 answers
585 views

What made this pile of tiny poops at the base of an old oak? Eastern Long Island, NY

I ran across three trees (all with cavities) that had mounds of these small droppings at their base. These were approximately 50-100 meters from the shore of a salt marsh on the east end of long ...
8 votes
0 answers
123 views

Why are animal's whiskers in a square lattice?

I was observing my cat up close when I noticed his whiskers were in a square lattice as a novice mathematician, took notice of it and wanted to know if any other animal had this peculiar feature, so I ...
7 votes
3 answers
1k views

Why haven't land animals evolved beyond urination?

It occurred to me (while urinating) that this would seem to be selected against because water is a scarce resource. Why are we constantly losing water we don't need to through urination? What is ...
2 votes
0 answers
218 views

Have lions, tigers, and cheetahs begun to lose or not yet fully gained tree climbing traits?

Leopards, jaguars, and the domestic cat all regularly climb trees, but lions and tigers rarely do. From what I can tell from a basic online search, the latter are inexpert tree climbers, but they ...
1 vote
0 answers
131 views

What mammalian species has the greatest relative variance in adult size?

The smallest adult chihuahuas weigh about 2 kg, and the largest adult English Mastiffs are around 104 kg, making them 52 times larger by weight. Of course, this enormous variance is the result of ...
1 vote
1 answer
135 views

What's the best sign language to teach a dolphin?

I know some scientists and trainers used hand signals to communicate with dolphins. The problem is: the dolphins have no hand to express themselves. With chimpanzees, we see how creative they are, not ...
3 votes
1 answer
757 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 ...
6 votes
1 answer
1k views

Why is the sex ratio of male and female cats close to 50/50 (with males actually being more prevalent)?

According to this study from 1970, cats are about 50% male and 50% female. Furthermore, there appear to be about 100 male pedigree cats born for every 92 female cats. I couldn't find any info about ...
4 votes
1 answer
734 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 ...
5 votes
1 answer
233 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 ...
4 votes
3 answers
118 views

Have scientists tried to communicate with Sperm whales?

I see lots of passive studies of sperm whale click "language", usually focused on fingerprinting to identify groups and individuals. There's application of deep learning, and all sorts of ...
2 votes
2 answers
358 views

What are the migratory patterns of Orcas in the Pacific Northwest? Do they pass by Vancouver in the Fall?

What are the migratory patterns of Orcas in the Pacific Northwest? Do the pass by Vancouver in the Fall? I know you can never predict the sightings of a wild creature, but I was wondering what the ...
0 votes
0 answers
175 views

What happens to quality of breast milk when twins of two different sexes are born?

It says here in Scientific American Mother's milk may be the first food, but it is not created equal. In humans and other mammals, researchers have found that milk composition changes depending on ...
5 votes
1 answer
174 views

What are these animals, and what happened here?

While walking along the northern shore of Lake Ontario, I noticed the following strange scene: Here is a closer angle: What are these animals, and what is the likeliest cause of this?
12 votes
2 answers
3k views

What hair do aquatic mammals have?

I'm reading an essay on the creating of the Mammalia zoological classification (Londa Schiebinger, The American Historical Review, Vol. 98, No. 2 (Apr., 1993), pp. 382-411). It contains the statement ...
1 vote
2 answers
171 views

Do whales ever just hang out on the surface breathing?

You only ever hear of whales surfacing for a brief second to exhale/inhale before they dive back down. But do they ever just stay at surface level, laying there with their blow hole up in the air, ...
2 votes
1 answer
149 views

Why do fish and marine mammals need special low density adaptations for buoyancy?

When one reads about fish and marine mammals, it is always said that for example blubber of marine mammals helps them with buoyancy because it is so low density and similarly for example sharks have ...
3 votes
2 answers
2k 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 ...
0 votes
2 answers
302 views

Is there any species of mammals where males can feed the offspring with milk?

It seems to me that an evolutionary path where not only females, but also males could feed the offsprings is entirely plausible: the males anyway have niples, so it is easy for the offsprings to ...
0 votes
3 answers
134 views

What is the primary cause of death for small animals in urban and suburban areas?

Small birds (sparrows, robins, jays, finches) and mammals (squirrels, rats, opossums, raccoons) are a common sight in many urban and suburban communities with green space. However, I observe carcasses ...
21 votes
3 answers
5k views

Why is wombat scat (feces) shaped like cubes?

I've heard that wombat scat 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?
4 votes
2 answers
681 views

To which ungulate species does this tooth remainder belong?

Found on the beach in Çanakkale, Turkey. I have found a lot of these, but this is the first one that has parts like long teeth. My other findings have sometimes 4, sometimes 6 tubes. Very solid, ...
3 votes
2 answers
7k views

What species is this rabbit-like animal?

This image was included in something I was browsing through. It reminds me of my lion head rabbit, but the head shape doesn't match. Is this some kind of Siberian wild rabbit?
0 votes
1 answer
252 views

If massive animals live longer, why do humans with gigantism die younger?

What I mean is humans suffering from gigantism (type 1 neurofibromatosis, Marfan syndrome, X-linked dominant acro-gigantism, et cetera) rarely live more than 5 decades (50 years). The same can be said ...
9 votes
1 answer
446 views

Identification of a mammal in cage

This unidentified animal was trapped in northern part of Kerala State India and images circulated through social media. Doea anyone know what species this is?
1 vote
1 answer
142 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 ...
-1 votes
1 answer
71 views

Did mammals evolve from something with eusociality?

Eusociality (from Greek εὖ eu "good" and social), the highest level of organization of sociality, is defined by the following characteristics: cooperative brood care (including care of ...
2 votes
1 answer
311 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
1 answer
67 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
1 answer
944 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
1 answer
3k 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
2 answers
2k 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
1 answer
368 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?
2 votes
1 answer
3k 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
1 answer
807 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?)
1 vote
1 answer
106 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 ...
7 votes
1 answer
279 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
2 3 4 5