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Questions tagged [mammals]

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

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Identify this vertebra

I was walking on the beach in New Jersey (U.S.), at about 40 degrees longitude, and found this bone. It's not a fish. The long process in the front is interesting. It is likely a C2 vertebra. I looked ...
Karl Kjer's user avatar
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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 ...
Einsteinium's user avatar
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 ...
Curious Layman's user avatar
4 votes
0 answers
57 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 ...
Michael MacAskill's user avatar
4 votes
0 answers
55 views

What do groundhogs and other subsurface-tunnel dwelling creatures do in heavy rains to avoid harm?

I notice groundhogs and many other tunneling creatures in my yard, the same yard which became pretty flooded during heavy rainfall. I don't see wildlife out during rain storms, but not long after, ...
cr0's user avatar
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4 votes
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51 views

Is the skin of feline jungle predators protected against ants?

I was watching a video of a jaguar stalking along a riverbank, killing prey, climbing up the muddy bank, then laying in thick brush to eat. My first thought about this is that there must be tons of ...
J.Todd's user avatar
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3 votes
0 answers
469 views

How old is the action of sneezing?

Is there an estimate for when the ability of sneezing evolved? A little bit of research, and some critical review of my memories tell me that: Many, if not maybe all mammals sneeze. Some reptiles ...
raggot's user avatar
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3 votes
0 answers
184 views

Mammalian scales

Many small mammals have scaly skin on their tails and sometimes limbs. The examples can be found among rodents (rats, degu, scaly-tailed squirrels), insectivores (shrews, desmans), oppossums, musky ...
OON's user avatar
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3 votes
0 answers
38 views

Why there are two rounds of cytosine de-methylation in mammalian development?

I assume that the key biological meaning of cytosine de-methylation during germline development in germline progenitor cells is to reset imprinted genes and then set methylation pattern on these genes ...
Sergei's user avatar
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3 votes
1 answer
339 views

How do marine mammals and penguins maintain bone density?

After much searching on Google with no results, I decided to ask my question here. If I'm not mistaken, swimmers' bone density is less than normal; at least for lifetime swimmers. Astronauts also ...
Rene's user avatar
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3 votes
1 answer
691 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 ...
Charles's user avatar
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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 ...
Triceratops's user avatar
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2 votes
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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 (...
G. Blaickner's user avatar
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 ...
user avatar
2 votes
0 answers
85 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.
Avani Agarwal's user avatar
2 votes
0 answers
47 views

What do chimpz/bonobos/orangutangs/gorillas feed their babies with?

I just read this question and it made me curious about what a more original baby diet would look like. So, at what age do our closest relatives in the animal kingdom start giving their offspring more ...
d-b's user avatar
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2 votes
0 answers
90 views

What is the closest relative to odd-toed ungulate?

I have seen about 3 variation of phylogenetic tree about odd-toed ungulate and I don't know which one is really updated or outdated or which one have more backed up theory First is odd-toed ungulate ...
Thaina's user avatar
  • 469
2 votes
0 answers
44 views

Do marsupials ever die in childbirth?

Question: Do marsupials ever die in childbirth? Obviously the notion of there being a linear ordering of "least advanced" to "most advanced" life forms isn't correct. Still, often marsupials are ...
Chill2Macht's user avatar
2 votes
0 answers
86 views

Are insects really strong or just small?

It's a common statement that insects are stronger, faster and jump higher than almost anything by mass. However, this leaves out that compared to their mass, all large creatures are actually pretty ...
Xonok's user avatar
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2 votes
0 answers
69 views

Basic behaviour patterns of animals for a modeling project?

I am working on a project (a tool) for my GIS class that models natural habitat of an animal based on landcovers, distance to the nearest watersource and distance from developed area in Kansas, USA. I ...
Jan Pisl's user avatar
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2 votes
0 answers
348 views

What is a common body composition in mammals?

The Physiology Of The Racing Greyhound states that most species have about a 40% muscle mass to body mass ratio. Understanding Body Composition puts "optimal fitness" in humans at 16-25% body fat for ...
user's user avatar
  • 131
2 votes
0 answers
18 views

Does level of bats activity differs from day to day?

Say we measure bats activity as number of passes through given area. Can it differ significantly depending from day to day or it stays on average roughly the same? I am wondering whether the following ...
Lukasz Tracewski's user avatar
2 votes
0 answers
69 views

How do I get recombinant proteins into the nucleus of mammal cells?

I know that there are Nuclear Localisation Sequencenes (NLS). They can be taken from endogenous or viral proteins and fused to the N or C terminus of my recombinant protein. Which is the best one? ...
jan-glx's user avatar
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2 votes
0 answers
40 views

Which agricultural crops attract rodents?

Are there any data on rodent populations per acre of different types of agricultural crops?
Matthew Piziak's user avatar
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 ...
Roger Wood's user avatar
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 ...
Krupip's user avatar
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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 ...
Psychonaut's user avatar
1 vote
0 answers
303 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 ...
Nicholas's user avatar
1 vote
0 answers
164 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 ...
Sonny's user avatar
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1 vote
0 answers
52 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 ...
scientific guest's user avatar
1 vote
0 answers
194 views

Are humans the only primates being engaged in group sex?

There are quite many examples of humans being involved in group sex. I won't say it is a common thing and won't say whether it is "natural" or "cultural" (but "cultural" only means induced to majority ...
rus9384's user avatar
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1 vote
0 answers
171 views

How "unique" human vagina is?

Regading penis Dixson showed that it is not really unique and complex. This argument (and there were some others) was used against the idea of human polygynandry. But what about vaginal shape? I know ...
rus9384's user avatar
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1 vote
0 answers
19 views

Is there any data to explore the heterozygosity of the South African lion over the last 18 years?

Background: I need to find data on the heterozygosity of the south African lion over the last 18 years... and I'm struggling: so far I have found a single data point. Question: Where can I find ...
hello_there_andy's user avatar
1 vote
0 answers
77 views

Are there mainstream views on the mandrill's coloration's being so unique?

According to the Wikipedia article: Mandrills are noted as being exceptionally colourful for mammalian standards. Charles Darwin wrote in The Descent of Man that "no other member in the whole ...
Zebrafish's user avatar
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1 vote
0 answers
11 views

Tests for object size discrimination in mammals?

Are there common testing protocols for establishing whether an animal (mammals especially) can distinguish the size of objects? In particular, are there procedures or is there good literature on ways ...
orome's user avatar
  • 111
1 vote
0 answers
216 views

How do marine mammals stay hydrated?

This is a question that has always bothered me. A quick internet search yields "metabolic processes" as the reason for how marine mammals obtain water, but what are those processes and why don't land ...
BlackThorn's user avatar
1 vote
0 answers
37 views

How do bats manage lymph fluids?

We all know that bats hang upside down to sleep. I was watching some sleep for a while, and they don't move much while asleep. If I fall asleep sitting in a chair my lower legs will swell. Lymph ...
James Jenkins's user avatar
1 vote
0 answers
133 views

Why wrap a dolphin in wet towels?

In this video, a dolphin jumps into a vessel. Even though the guides know they will be quickly helping the dolphin back into the water, they first make sure they wrap the mammal with wet towels. Why ...
End Antisemitic Hate's user avatar
1 vote
0 answers
198 views

Why do some macaques have redder faces than others?

I'm watching Monkey Kingdom, and I noticed some of the macaques have redder faces than others. Specifically the females, and as the social ladder increases, so does the redness. An alpha female: ...
360ueck's user avatar
  • 298
1 vote
0 answers
95 views

Omnivore vs Carnivore territory size

Edit: Large carnivores require lots of territory. What about bears? They're omnivores. How much does that count? Is there anywhere I could find weight/territory ratios for mammals, depending on diet? ...
user85190's user avatar
  • 111
1 vote
0 answers
96 views

How important is the womb's environment?

- Background - Talking about one phenotypic trait, the total phenotypic variance $V_p$ is decomposed into genetic and environmental variance for this trait, represented by the symbols $V_G$ and $V_E$ ...
Remi.b's user avatar
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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 ...
Grazlewacky's user avatar
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 ...
Profile name's user avatar
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..?).
Iain Sanders's user avatar
0 votes
0 answers
62 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 ...
whitewings's user avatar
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:...
K-Feldspar's user avatar
0 votes
0 answers
907 views

What was the first animal having fur?

Did all early mammals have fur? Is it possible to trace the origins, how early animals with fur looked like and how it evolved?
Petr's user avatar
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0 votes
0 answers
30 views

Is it possible for two creature in the same order and have odd haploid chromosome species to reproduce

Take the degu and the rat for example. The degu has 29 chromosome pairs Rats have 21 chromosome pairs. They are only share the same order ( Rodentia ) Would it be possible for them to reproduce? ( ...
Theocles of Saturn's user avatar
0 votes
1 answer
51 views

Do the individual claws of a bear have names?

The question seems pretty self-explanatory (if perhaps a little odd). Anatomical names or colloquial names are both appreciated, especially the latter if they exist.
Random's user avatar
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