Questions tagged [mammals]

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

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2
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1answer
359 views

Why can one swim longer underwater by blowing out air?

I am a human. I take a deep breath. I swim underwater... After some time, I need to blow out some air. I blow out some air... By doing so, I can swim underwater longer. Blowing out some air gives me ...
12
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2answers
171 views

Can dolphins actually communicate linguistically?

Humans use "language." By language, I mean the thing I am using right now to talk to you. I know dolphins and orcas have very complex communication systems and also seem to process linguistic and ...
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1answer
223 views

Gestation period of African savanna elephants?

I found out it is 22 months for African bush elephants, but is this also true for African savanna elephants?
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1answer
212 views

What is the biochemistry of love?

How is love induced between humans? (e.g. between mother and child,couples,etc)? Does the phenomenon of love exist in other mammals, too?
3
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2answers
636 views

Why do cats' claws retract?

Humans have nails, horses have hooves - but they are always exposed. Why are cats' claws retractable rather than always exposed? Is it related to "Why are there nail growth differences between humans ...
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1answer
200 views

Why do mammals produce more carbon dioxide than insects?

I understand that mammals produce more carbon dioxide than insects on a gram per gram basis, but why is that? I'm thinking it might be because mammals are warm-blooded, which require more energy ...
8
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1answer
1k views

Are Sloth tongues soft or rough?

Are Sloth tongues soft or rough? Dogs have soft tongues, while cats have rough tongues, so the feeling when they lick e.g. a human hand is quite different. So what about sloths? This question came ...
11
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1answer
5k views

Mammal body density

Human body density is approximately 1 kg/l (same as fresh water) - which is not surprising (at first) given that we are 70% water, and is surprising (on a second thought), given that the other 30% can ...
8
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1answer
533 views

Biggest change in size from birth

Which mammal has the largest change in size from birth to fully grown percentage wise?
4
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2answers
148 views

How can bobcats feel the mice under the snow?

I've just seen the Planet Earth II's second episode "Mountains" where they shock us with these North American bobcats that can feel mice from the distance of several meters, sneak to them and kill ...
-1
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1answer
46 views

Are these principles worth being validated? [closed]

Odunayo's principle of inhalation states that provided a given amount of water is ingested, inhalation through the nostrils will be excluded due to the presence of oxygen in the water. From the above ...
3
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1answer
76 views

Was mammal body better suited for some type of the marine environment than the body of fish?

When some of the land mammals came back to the oceans, they seem to be successful in the competition with fish at least in some environment even though they seem to have a huge disadvantage in the ...
23
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1answer
8k views

Why can't humans drink sea water?

Why can't humans drink sea water? It would seem to be a huge evolutionary advantage for an animal to be able to drink sea water rather than have to rely on fresh water, and it's provably not ...
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0answers
258 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:...
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0answers
859 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?
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0answers
223 views

These Mammals Had a Good Run, So What Happened? [closed]

One of the great mysteries of the mammals is that some of the longest-lasting just aren't with us today. The list of these puzzling unfortunates is as follows: Paleomerycidae DURATION: 55.8 to 4.9 ...
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0answers
89 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 ...
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1answer
265 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?
3
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1answer
363 views

Is there any evidence for secondarily poikilothermic vertebrate? [closed]

Is it possible that an endothermic physiology can evolve into an ectothermic (poikilothermic) physiology? I have a non-scientific gut feeling that it is irreversible. Whales and dolphins are evolved ...
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0answers
265 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 ...
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0answers
59 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 ...
8
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1answer
394 views

What is the reason for fear induced defecation?

I started to handle mice for my job and noticed that they tend to defecate and/or urinate when they are scared. The fear is induced by me, because I need a long time (due to inexperience) to grab the ...
17
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1answer
3k views

Could a fetus properly develop in micro/zero-gravity?

I suppose another way of looking at the question is: how important is gravity for the development of mammal fetuses? And if things would go wrong, what sort of things would they be, and what would be ...
11
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1answer
1k views

What species of fox is this?

I found this picture of a fox in a news article about arctic foxes in Sweden (source), but I'm not sure whether it is actually an arctic fox. On the one hand, it has white fur, which is the correct ...
4
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1answer
130 views

Identification of a small mammal

Could someone help with identification of this small mammal? Is it a possum? A dormouse? It was photographed in Sukhumi botanical garden, in Abkhazia (west of Georgia, on the shores of the black sea)....
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0answers
57 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: ...
2
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1answer
742 views

Can kit foxes and red foxes produce offspring?

Can a kit fox (Vulpes macrotis) and a red fox (Vulpes vulpes) together produce offspring? Would such a hybrid be fertile?
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75 views

Why is a wound much more painful when damp?

Why is a wound much more painful when damp? This is a very strange phenomenon. For example: I have a little wound, not painful at all. But, when it is just damp, it is much painful.
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0answers
53 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? ...
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1answer
126 views

What are these curious cetaceans?

At the beginning of the superb documentary film “Un jardin d’Eden sous les mers” (“A garden of Eden under the seas”) [1], we see a group of curious cetaceans. At about 1 min. What are these ...
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0answers
427 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 ...
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0answers
34 views

How is the brain kickstarted during development [closed]

The brain is a complicated beast, that operates (generally) by electrical activity. During development, all cells originate from the a single "cell": the zygote. At some point during development, the ...
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0answers
29 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? ( ...
2
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1answer
120 views

Whales and cancer [duplicate]

Do whales get less cancer than they should considering they have a lot more cells and tissue? If a lot of cancer formation is random because of mutations then shouldn't whales receive a lot of ...
7
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1answer
257 views

Is it theoretically possible to restore the Tiger population to 100,000?

The current global Tiger population is roughly 5100 according to Wikipedia. With habitat destruction and poaching continuing and no effective improvement in conservation, most likely the Tiger ...
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2answers
2k views

Why do rabbits often have white hindquarters?

There are several species of herbivores that have a very visible white hindquarters: several kinds of deer, rabbits, antelopes, etc. Does the white fur serve a functional purpose, or is it purely ...
9
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1answer
142 views

Do camels pose an environmental threat to kangaroos?

Camels, once used for transport across the Australian outback, were set free, and are reproducing at an uncontrolled rate in the empty interior of Australia. Do the ecosystems of camels and ...
2
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1answer
5k 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 ...
3
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1answer
259 views

Are the byproducts of mammalian digestion simply depleted versions of the food or liquid consumed?

When mammals consume food and digest it or drink fluids that are then filtered by their kidneys, are the waste products generated simply depleted versions of what they consumed? Are there other ...
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1answer
253 views

Red fox with blue legs

On the Wikipedia I found this photo of a red fox, labeled as being taken at Quesnel Lake, British Columbia: Why would the fox have blue legs? Is that normal for a Red Fox?
2
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1answer
42k views

Cats, Dogs and Bears - how are they related?

What is the ancestral relationship between cats, dogs and bears? I presume they are more closely related to one another than other paraphyletic clades of mammal. Which came first? What did their ...
2
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1answer
142 views

Heteromaternal Superfecundation - Any known cases?

Superfecundation in mammals (fertilization of two or more ova from the same cycle by sperm from separate acts of sexual intercourse) -- Is possible in nature from different fathers (Heteropaternal) as ...
2
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0answers
14 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 ...
5
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1answer
598 views

The ermine's colour and geographical range

Ermines turn white during the winter, with only the tip of the tail remaining black. However, in the southern regions of the ermine's range it clearly doesn't get so white. Encyclopedia of Life says ...
3
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1answer
265 views

Why do surface mole tunnels follow directly below the electric fenceline

I have electric fencing enclosing five acres, and moles always seem to tunnel in a straight line just under the electric fence - are they following a force field? Can that be?
9
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2answers
214 views

How can bats achieve good resolution with wide beams?

I have been reading about the echolocation system in bats. papers state that bats tend to produce a sonar beam that has a beam angle (-3db) of about 30-40 degrees. This would be considered a wide beam ...
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1answer
64 views

Why do teeth decay of sugar?

Sugars is a common component in diet of mammals. Why then their teeth did not develop resistence to sugar decay?
3
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1answer
276 views

Mammal vs Placental Mammal

So for Google Earth Day's quiz I ended up being a "Pangolin." Turns out I had no idea what it was so I looked into it and honestly it reminded me a lot of an Armadillo. So I decided to find out the ...
22
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2answers
31k views

How and why did mammals go back to the oceans?

If I understand evolutionary biology correctly, mammals first evolved on land as small, rodent-like creatures, in a time when reptiles were dominant on land. Eventually, they diversified into the ...
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0answers
33 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 ...