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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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What is the purpose of brow ridges in primates?

What is the purpose of brow ridges in primates? Why are they universal in anthropoids but not prosimians? Why don’t humans have them? How do they affect perception, notably vision? Do they protect the ...
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1answer
65 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 ...
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2answers
86 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 ...
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1answer
121 views

Why do some animals have beards?

Why do some animals such as some Goats, Ibex, Orangutan etc, have long well-shaped beard like men?
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1answer
50 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 ...
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38 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 ...
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85 views

Which mammal produces the most milk?

I'm searching for mammal who can produce most milk whenever she lactate. I Googled it but it says dairy cattle which biologically speaking is not right answer, because a baby whale can drink up to 150 ...
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54 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 ...
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128 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 ...
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2answers
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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?
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1answer
169 views

Are bears related to dogs in a similar way to how cats are related to 'panthers'?

I've tried searching on Wikipedia but I couldn't find what family dogs belonged to. Ursidae is 'bears' and Canis is 'dogs' ; Panthera is big cats like:- tigers and jaguars is what I know.
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Is there any known reason why 6 leg mammals are only found in mutations? [duplicate]

Taking a look in internet you can find photos of mutated mammals with 6 legs. Some cows with legs in unnatural positions were shown in website versions of widely known newspapers (you can easily guess ...
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3answers
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Could a mammal convert ingested dissolved CO2 to usable energy?

I'm trying to find out if it's possible that a mammal could orally ingest dissolved CO2 and convert it to energy for body heat, organ function, etc. Unfortunately, most of the scientific sources I've ...
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68 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 ...
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0answers
23 views

When did placental mammals arrive in North America?

I saw a documentary with a lot of details about the replacement of marsupial bears and wolves of the Americas with placental ones. I can't find information about them, does someone have some ...
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1answer
87 views

How does the bear mother ensure her cubs don't escape during hibernation?

I have some questions relating to bears- more specifically, the brown bears we have in Scandinavia. When they go into hibernation, do they fall asleep as we know falling asleep? If a bear mother ...
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0answers
63 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 ...
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0answers
34 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, ...
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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 ...
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28 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 ...
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1answer
296 views

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 ...
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1answer
103 views

Do individual mammal hairs absorb water?

In my look into the world of shaving I've seen claims that it is better to shave after a shower because the hairs will absorb water and soften, making the shave easier. Likewise, I've seen it claimed ...
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1answer
82 views

When you lose weight, how does the mass exit your body?

As a thought experiment, consider the case of Angus Barbiery, who allegedly lost almost 200kg in about a year by not eating at all, save for necessary nutrients provided as supplements. My question ...
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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 ...
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0answers
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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 ...
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1answer
243 views

When did the mammalian outer ear evolve?

All Eutheria and Metatheria have outer ears, and as far as I found out, monotremes once also had them, so they seem to be universal for mammals. Did other synapsids have them, too? I know that soft ...
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2answers
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Why are monotremes so rare?

There are currently only five species of monotremes remaining, and all of them are found in Australia. Additionally, I read a science article claiming that competition from marsupials essentially ...
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1answer
56 views

Can bats echolocation discern what insects they are preying on?

Insectivorous bats feed on many different types of insects such as mosquitoes, moths, beetles, and bees. According to the Bat Conservation Trust, bats can discern insects from other objects but I'm ...
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1answer
105 views

Is there any research on wolf and bobcat interactions?

I'm studying interactions between North American predators, specifically wolves, coyotes and bobcats. There's evidence from data I've collected from game cameras that suggests a significant ...
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2answers
576 views

Why do animals have fur and feathers?

Does it give them protections from harm? Sphynx cats, being furless, can get hurt from thorns if they go through bushes So I'm assuming it's more like defense from animals biting them. A lion mane ...
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2answers
99 views

What British bat is this?

What kind of bat is this? I saw it flying quickly between trees in Buckinghamshire, UK, at about 4pm in September (so about three hours before sunset). I think it might be a common noctule but I was ...
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2answers
126 views

Have there ever been as many mammals as there are now?

I apologize for the weird question, but based on a Google search it looks like this topic hasn't been discussed before. I'm hoping that enough information about population biology is stored in the ...
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0answers
97 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 ...
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1answer
99 views

Do squirrels and blue jays play a role in oak tree distribution?

White oak (Quercas alba) acorns have lower tannin levels than red oak (Quercas rubra) acorns, therefore animals tend to eat the white oak acorns before red oak acorns. Animals such as squirrels and ...
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1answer
134 views

Can platypuses communicate via electroreception?

I know at least some electroreceptive fish are capable of basic communication with other members of their species via varying their own bioelectric signals. However, I can't find any information as ...
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3answers
146 views

What processes regulate the sex of offspring?

It is known that some species are more likely to born male than female (and some maybe vice versa). I understand that it is due to evolutionary perspective (average number of adult males is close to ...
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1answer
49 views

Albino elephants

How many albino elephants are there across the world? There is no information on the total number of albino elephants across the world except for the few albino elephants captured by people.
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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 ...
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1answer
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Picture of a camel's red blood cells

I'm an art student in need of a little help. I'm looking for microscopic pictures of camel's red blood cells, I need their shape for an art project. The pictures I find on Google seem a little ...
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1answer
29 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.
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128 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 ...
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1answer
35 views

Do Pthirus gorillae remain in gorilla leaf nests after gorillas migrate and abandon them?

Gorillas build leaf nests to sleep in. Do the lice which parasitise gorillas, Pthirus gorilla, remain in gorilla leaf nests after gorillas migrate to new regions (and abandon the old nests)?
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4answers
570 views

What sea animal is this?

I am in a remote village and a young boy (second pic holding tail) says this thing is his friend. This creature is safe, we held it for pictures and released it after. None of us know what this is and ...
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1answer
100 views

Where to begin studying Biology in earnest, with preferably free sources?

I am a biology enthusiast and would like to study Biology in earnest. I have basic knowledge of biology (high school level) and some extended knowledge of small animals, mainly about mammals as I am ...
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1answer
123 views

Why do sea mammals die on land, and drown on sea?

It's quite confusing to me, why do sea mammals die on land, but also die from drowning if they couldn't reach the sea surface to breath? Excuse my ignorance but I am really confused!
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1answer
855 views

Whose horns are these?

Can anyone please help me identify these horns? I guess they belonged to either European or Asian species. I don't know anything about their history -- they are my grandparents' who are from Moscow, ...
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0answers
46 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 ...
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0answers
61 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 ...
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1answer
40 views

Which variables are controlled in the mammalian womb to ensure a healthy environment?

Recently, researchers have had some success with artificial wombs. Which aspects of the womb are difficult to replicate through technology?
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1answer
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Are there examples of animals that live in groups, where all have the same role?

For animals that live in groups, are there examples where all of them have the same role? For example, in animals we know there are bee queens or alpha, beta and omega mammals. But are there groups of ...