Questions tagged [mammals]
Questions related to mammals, animals that nurse their young, have a neocortex, and three middle ear bones.
218
questions
0
votes
0
answers
33
views
Why do dogs still have periods if they have an estrous cycle?
I recently learned that in most mammals, the endometrium is reabsorbed in the estrous cycle. Thus, I would expect dogs not to have periods (at least similar to periods that come from the menstrual ...
- 723
2
votes
0
answers
80
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 ...
user71105
8
votes
0
answers
88
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 ...
- 81
1
vote
0
answers
49
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 ...
- 119
1
vote
1
answer
80
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 ...
- 166
5
votes
1
answer
110
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 ...
- 153
0
votes
0
answers
83
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
158
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?
- 291
0
votes
2
answers
128
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 ...
- 2,946
2
votes
1
answer
70
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 ...
- 23
4
votes
2
answers
206
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, ...
- 65
2
votes
2
answers
155
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 ...
- 265
-1
votes
1
answer
120
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 ...
1
vote
2
answers
101
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, ...
- 121
4
votes
3
answers
106
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 ...
- 141
-1
votes
1
answer
52
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 ...
- 157
2
votes
1
answer
165
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 ...
- 153
3
votes
1
answer
58
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 ...
- 133
26
votes
1
answer
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 ...
2
votes
1
answer
254
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?
- 660
1
vote
1
answer
1k
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 ...
- 121
1
vote
1
answer
95
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 ...
- 259
0
votes
3
answers
119
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 ...
- 111
1
vote
1
answer
29
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 ...
0
votes
1
answer
104
views
Has a primate species ever weighed the average mass of a tonne (1000 kg)?
If so, why can't primates weight a metric ton?
0
votes
1
answer
35
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 ...
- 3,042
-6
votes
1
answer
58
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?
- 13
-5
votes
2
answers
151
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 ...
- 13
5
votes
1
answer
210
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 ...
- 1,024
0
votes
2
answers
486
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 ...
- 140
1
vote
0
answers
152
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 ...
- 81
3
votes
1
answer
55
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 ...
- 133
1
vote
1
answer
97
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
1
answer
386
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, ...
- 81
2
votes
2
answers
164
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.
- 269
1
vote
0
answers
99
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 ...
- 9
2
votes
1
answer
245
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 ...
- 123
4
votes
0
answers
45
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 ...
3
votes
1
answer
329
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 ...
- 139
2
votes
0
answers
65
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
0
answers
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
1
answer
287
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 ...
- 4,521
1
vote
1
answer
416
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
0
answers
56
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 ...
- 101
2
votes
1
answer
85
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 ...
- 121
1
vote
0
answers
36
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
1
answer
103
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 ...
- 262
0
votes
1
answer
44
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 ...
- 57
4
votes
1
answer
85
views
How are the first mammary glands thought to have functioned?
I happened upon a book (not about biology) containing this text:
A life-changing birth occurred on the planet about 190 million years ago [...] the first tiny shrew like creature brought forth an ...
- 3,266
1
vote
2
answers
231
views
Why aren't mammals and reptiles considered amphibians?
We've all heard it: birds descend from dinosaurs, so they're dinosaurs too. But this got me thinking: doesn't this mean that, for instance, all terrestrial vertebrates – including humans – are ...
- 13