The biological study of animals.

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447 views

How do sharks and other fish conserve and gain water in marine environments?

With the osmolarity of the average vertebrate being around 300mOsml, and salt water having an osmolarity of 1000mOsml, why does the water from the shark not leave to the salt water around it? I ...
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1answer
72 views

Does anyone know what marsupial this is? [closed]

I know what this is a marsupial, but i'm not quite sure which one. Any thoughts?
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1answer
900 views

How strong is spider silk?

Spider silk is pretty darn strong and all sorts of comparisons are made to steel. I'm more curious about the various moduli of spider silk and how it compares to other materials. What is the Young's ...
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2answers
620 views

Did dinosaurs have more than one brain? If so, why?

I once remember reading (15 years ago) that dinosaurs had two brains. One for their head and another one for their digestive functions. What is the current opinion on this theory? Has more evidence ...
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1answer
627 views

Do egg laying animals experience a pregnancy?

Does a female animal that lays eggs experience a pregnancy-like period of time, where she will feel and behave differently as if she were fertilized and her body is prepared to lay a fertile egg, not ...
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2answers
404 views

Do cockroaches have less health issues than humans?

Cockroaches are known to live in very dirty places like sewers. Does this cause them to evolve to be stronger against parasites and bacteria? Recently I read online that cockroaches can sustain ...
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2answers
527 views

What would it take to recognize a deer by its photo?

I am trying to recognize a deer by its antlers or any other means. Elaborating: I was hoping to use their antlers to recognize them but I have heard that most deers shed their antlers every year so ...
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0answers
23 views

Do the antlers re-grow in the same pattern every year? [duplicate]

I am a software engineer and I am trying to develop a system to identify a deer by its photograph. Most deers lose their antlers every year. I would like to know if they re-grow in the same pattern ...
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2answers
288 views

How long can you keep sheep eyes in formaldehyde before dissecting?

We're preparing for an experiment in our classroom and my teaching partner and I are at different points in the unit. I am concerned that the experiment will be less successful because of the ...
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1answer
201 views

What limits the size of fish compared to marine mammals?

The largest extant fish species is the whale shark (Rhincodon typus). With a length of 13 meters and a mass of about 20-30 metric tons, the whale shark is relatively small compared to the largest ...
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3answers
2k views

Species with reproduction barriers that can both reproduce with a third species

To start with, I do not have a sound knowledge in biology or any formal education in the area. I was told that one of the definition of a species is a reproductive barrier, which means that if two ...
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1answer
68 views

Is there an animal which, when eaten by other animal, poisons the predator and gets out of it's stomach?

It was a question in one competition, but it remained unanswered and i am curious about an answer. There was a hint: American bullfrog but i can not find any example of this behaviour on the web.
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519 views

How does a jumping spider manage to “jump” on the ceiling?

I just witnessed a small jumping spider jump on some kind of louse or bed bug on the ceiling. How does it do that without falling? I have yet to find a high-speed-camera video of a jumping spider ...
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2answers
106 views

Is there a term for tool use in animals?

Is there a technical/scientific term that scientists use to refer to tool making abilities found in certain types of animals? Reference ...
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4answers
301 views

What was the reason for some plant and animals to become giant in course of evolution?

The dinosaurs, mammoths, giant plants etc are known to be bigger than modern animals. I wonder why they had been lived and why they are not living now? I really don't know much but is it something ...
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2answers
542 views
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3answers
1k views

Is the theory of evolution being disproved by bats?

For some species the Darwin's theory evolution makes perfect sense. I can easily imagine how, for example, the giraffe has evolved to its current appearance: the natural selection was favoring ...
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2answers
1k views

Why do some animals have 8 Limbs (e.g. Spiders, Octopuses)?

Octopuses have 8 tentacles, spiders have 8 legs. Is there something special about 8? It seems like an animal that needs 360° mobility has 8 legs.
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2answers
456 views

Why is the frog genome so much larger than a fish's?

As we have heard in the summaries of the human ENCODE project, 80 per cent of junk DNA appears to have an essential function. Many fish have a genome with only one tenth the size of a usual vertebrate ...
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0answers
29 views

Where might I find a list of all recorded instincts by species? [closed]

Where might I find a list of all recorded instincts (possibly with all other attributes) by species? Thanks, Chenz
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2answers
738 views

Can female Drosophila melanogaster lay eggs without males?

Can female Drosophila melanogaster lay egg without males? I maintain our lab stock but find a line that seems to have all females (or all males). In the vial, I see some eggs laid, but the flies ...
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2answers
359 views

Do any cells change in size or mass as mammals grow?

That is to say, are there cells that, between infancy and adulthood, get larger? Or is all growth done entirely via cell division? I'm wondering if it is safe to assume that the approximate number ...
3
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1answer
151 views

By What Mechanism can Felines Reverse Diabetes?

To my knowledge house cats (and likely other felines) are the only animal able to go into remission after onset of Type 2 diabetes mellitus. I don't have a reference, this has been by peers in my ...
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1answer
531 views

When do most mammals mate?

Is one part of the day more prevalent then other when it comes to mammal animals mating? Is there an aggregating study that has been done to see if these living beings in nature mate mostly during day ...
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2answers
1k views

Difference between mice and rats

What is the actual biological difference between mice and rats? Are they actually the same thing with two different names depending on appearance (are they all mice for instance and we call the larger ...
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1answer
62 views

Is there such thing as “meters per calorie” for living organisms?

I'm interested in learning if there's some way of quantifying the organism's metabolic efficiency associated with movement. It seems to me that some organisms would be more efficient than others at ...
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1answer
60 views

Diet of free-range herbivores

Giving minimal credence to estimates in popular media of the average biomass of insects/arachnids, etc. in an acre of land, it seems that a "free-range" cow (I don't mean to pick on cows) might be ...
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1answer
99 views

Predators faking to be not hungry?

I believe that there are predator/prey combinations where the prey can easily spot that the predator is not hungry and will not try to flee from it. I’m thinking, for example, of gazelles who will ...
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2answers
53 views

What do breeders call the effect when a breed resists modification?

It is impossible to breed a blue rose or a cat with a bulldog shape. This is because breeding is limited by gene variations in the population. What do breeders call this effect? UPDATE I guess ...
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1answer
565 views

Do all sea creatures that have scales have to have fins?

Do all sea creatures that have scales have to have fins? Do we know of any sea creatures that have only scales without fins? I'm especially interested in fish that have scales but no fins.
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1answer
407 views

What is the known maximum ranging distance of a bat's sonar?

Bats are known to navigate by using echo-location. How far away can a bat detect an object by its sonar?
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1answer
93 views

Reattaching body parts

Is there any living organism that has the ability to remove and reattach body parts at will? I'm not talking about regeneration (like in starfish). Say I'm chasing prey, and I decide that my tail ...
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1answer
174 views

Do goldfish really have a 5 second memory span?

I heard that when people place goldfish in another tank, they just forget where they where previously? True or False ?
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1answer
373 views

Why do the feet of the Gecko Lizard not stick to Teflon surfaces?

I have noticed that lizards feet can stick to walls but not to Teflon surfaces? Why is that?
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1answer
367 views

How can an albatross stay airborne for months?

Albatrosses, of the biological family Diomedeidae, are large seabirds allied to the procellariids, storm-petrels and diving-petrels in the order Procellariiformes. They range widely in the Southern ...
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1answer
109 views

Does culling badgers restrict the spread of bovine tuberculosis?

The British government has announced that it plans a large-scale badger cull which they argue are implicated in the spread of Mycobacterium bovis - so-called bovine tuberculosis. Any cattle that ...
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0answers
54 views

Help with designing the analysis of radio telemetry study [closed]

I was wondering if there are any spatial ecologists out there who can provide some insight on the trouble I'm having with my Masters research. I am looking at the association a bat species to high ...
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2answers
594 views

Why do stranded marine mammals die so quickly?

Mammals have lungs, so do marine mammals. Nevertheless some marine mammals seem to die rather quickly when they strand on a beach. As they have lungs and can breath while on land, why do they die so ...
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1answer
349 views

How do members of cryptic species know who to mate with?

According to Wikipedia: In biology, a cryptic species complex is a group of species which satisfy the biological definition of species—that is, they are reproductively isolated from each ...
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1answer
564 views

How do porcupines keep from pricking each other while mating?

How do porcupines keep from pricking each other while mating? It seems like they would constantly be scratching each other.
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1answer
203 views

How does sex differentiation work in Paracerceis sculpta, the sexually tetramorphic isopod?

Paracerceis sculpta is a marine isopod species known for its unusual reproductive strategy: female: medium-sized; lives in harems run by an α male α male: large; keeps a harem of females β male: ...
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1answer
167 views

Is there a way for a 19th century scientist to prove that the octopus doesn't revive?

Say a sophiscated scientist in the 19th century noted that applying soy sauce on a dead octopus leads to movement of the legs, as a result of the voltage differences resulting from the salt in the soy ...
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3answers
186 views

Do dogs have something different about their physiology that allows them to pant without hyperventilating?

I was wondering this as I considered how effective panting would be for humans as a means of cooling.
4
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1answer
211 views

Why would deers keep crossing a river full of crocodiles while some of them have been killed?

I recently watched a clip on Discovery Channel, where I saw deers crossing a river full of crocodiles, ignoring the fact that some of them would have been killed doing so. What could be an ...
3
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1answer
48 views

Is there such thing as “biological cycles” of activity/performance/etc in mammals?

I'm looking for some information about the cycles of increased/decreased activity, mental performance or endurance that are related to a mammal's age and the time of a season. First of all, I'm not ...
3
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1answer
1k views

Does cockroach lay eggs in human flesh when they “bite”?

Recently, i have "bite" by cockroach, not only the "bitten" area red and swallowing, and more specificly, it have a big hole in that area, when i clean it with hydrogen peroxide solution, something is ...
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3answers
136 views

How do baby animals that primarily subsist on cellulose get their initial gut flora?

In the case of mammals like giraffes and koalas, is that bacteria common on the plants they eat so when a baby starts to try to stick something besides its mother's milk in its mouth, it can't digest ...
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3answers
2k views

Why does the butterfly have a cocoon stage in its life cycle?

Why does the butterfly have a cocoon stage in its life cycle? It could have simply grown up within the egg/cocoon, and emerged as a butterfly. Instead it is first an egg, then a worm, then a ...
5
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1answer
130 views

Is there any reason the common housefly continues to return to an area?

This might come off as a really silly question. But I'm wondering (especially in the case of food) if there is any reason a fly would continue to try and sit on top of a piece of food even after ...
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1answer
921 views

Is there a relationship between efficiency of cellular metabolism and warm-blooded-ness?

My BIO 101 book states that when human cells convert glucose to ATP, the process is only approx 35% efficient, and much of the potential energy is lost as heat. However, that heat is useful to us in ...