Tagged Questions

The biological study of animals.

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2
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1answer
543 views

Do bigger animals have more testosterone?

I was wondering the other day outside, thinking about varieties of species and their aggression levels, etc. I had a theory that since these highly aggressive, powerful, and viciously advantageous ...
5
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2answers
110 views

Transitivity of Species Definitions

There are many definitions of "species" which usually take the form Two individuals are of the same species if ... An implied (rarely made explicit) property of any sensible species definition ...
1
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0answers
36 views

Are there mice pedometers?

I am seeking to make treatments for arthritis. Earlier, I asked a question about Protocol for measuring stamina of arthritic mice, and I also know that some earlier studies have used pedometers. As a ...
0
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1answer
59 views

Function of carapace

Majority of crustacean larvae have expanded carapace drawn out into processes as an adaptation for : a. Protection from enemies b. Planktonic habit The answer given is b but I think it should be ...
1
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1answer
97 views

Why would the Camargue horses have a white coat while the foal have a dark coat?

The current issue of the magazine Lonely Planet India(Oct 2013) presents a photo of Camargue Horses which are white coated and mentions that they are born with dark hair. A search shows that the foal ...
3
votes
1answer
72 views

Will a garter snake eat unusual prey if made to smell like something normal?

I have noticed that my garter snake only eats after it has smelled it's prey to make sure it is a slug, and it doesn't matter whether it's moving or not. If I were to coat, say, a caterpillar with ...
4
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1answer
111 views

Identification of this Salamander

This salamander was found in a small forest pond somewhat near the Oregon coast. In the area are many rough skinned newts and a small number of another type of salamander that I still can't find the ...
3
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1answer
75 views

Fear in elephants

It has been noted that elephants trained for war, as was done occasionally in earlier times, have still shown a tendency to panic in battle much more often when compared to a war horse trained for the ...
2
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1answer
270 views

Why are urban birds still scared of humans?

I understand that animals are naturally scared of humans because we basically slaughtered every living thing we found in our way for millennia. How long does it take for them to genetically 'forget' ...
2
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1answer
53 views

Can a chicken's lard become liquid depending on its diet?

On Cooking.se, somebody asked a question about the fat in chicken stock sometimes being liquid and sometimes solid once the stock has cooled. The only answer until now suggests that the difference is ...
2
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0answers
38 views

What's behind the amazing colour combinations in pests & insects?

What's behind the amazing colour combinations in pests & insects ? Do this colour combination signals any character/ poison of the pest/insect ?
3
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0answers
115 views

how much grass does a sheep eat in square meters per day? [closed]

I want to buy some sheeps in order to eat my garden's grass. How much grass does a sheep eat each day ??
2
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0answers
62 views

Where are the gastralia (stomach ribs) attached?

Crocodiles and some dinosaurs have a second set of ribs between the sternum and pelvis called gastralia. Where are the gastralia attached to the rest of the skeleton?
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4answers
2k views

Why we have no enzyme to digest cellulose?

As we know, cellulose is the most abundant polysaccharide in nature. Why don't we have any enzyme to digest cellulose?
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0answers
34 views

Does sleep duration vary for animals based on time of the year?

I'm interested in the sleep patterns of wild animals, that still use sun for controlling their biological clock. Animals entrain their biological clock to the day/night cycle using light as the ...
1
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0answers
31 views

How did specialized nerve-based behaviors emerge in organisms? [closed]

There are quite a lot of diversity in behaviors of animals and lesser organisms, like mating, hunting, feeding, hiding and avoiding predators. At the same time I know that many hormones like ...
4
votes
2answers
51 views

What animal's lower eye lid moves to upper one when closing eyes?

I know cock's lower eye lids moves to meet the upper one when it closes its eye. What other animals does this? BTW, "cock-eyed" can mean upside down, I think.
5
votes
2answers
160 views

If a dead snake reflexively attacks itself, why does it not always attack itself?

Recently there has been this video going around of a snake that had been decapitated. Its body swung around to the decapitated head and the head attacked the body on "reflex". Now we know that most ...
6
votes
2answers
649 views

Do animals get sick from eating dirty food or eating off the floor?

Humans have very strict tradition of hygiene, such as washing hands before eating, using utensils, and in general keeping as much distance between food and dirt as possible. At the same time, most ...
1
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0answers
101 views

Green feather-like formations in tap water - what is it? (with pictures)

These things recently appeared in my tap water Copenhagen Denmark, this summer 2013. They are very small, and have a feather like structure. I've called the water supply, and they thought that it was ...
2
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1answer
137 views

What kind of insect is this?

Found in Russia in the kitchen. It is about 3 mm long.
1
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1answer
166 views

Raphide toxicity in Pothos plant

Recently I found out that the common houseplant Pothos (Epipremnum aureum) is toxic to cats and dogs due to the presence of "insoluble raphides." I have a lot of these plants around my house and my ...
6
votes
2answers
499 views

Goats are so fearless but sheep are not. Is there any genetic difference responsible?

As you see in the picture goats (not only wild goats) are so fearless, but I never saw any sheep do this. What is the source of this difference in behavior?
3
votes
1answer
197 views

Is there a difference between pig and cow anatomy that makes religious slaughter of the latter less painful?

This question is not for the squeamish. I was told that non-Kosher animals like pigs have a different anatomy in their neck compared to kosher animals like cows such that the Shechita method of ...
2
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3answers
3k views

Laying eggs vs giving birth: is there a connection with internal vs. external ears?

I have heard that "The animals who have their 'EARS' outside their body give birth to their young ones and the animals who have their 'EARS' inside their body lay eggs." Is this true? Are there ...
4
votes
4answers
713 views

Do male animals visually perceive females as more/less attractive?

If we somehow remove pheromones, do animals experience a phenomenon similar to human "visual beauty" when looking at members of the opposite sex? For example, given a set of 20 female ducks observed ...
10
votes
4answers
2k views

Why do parasites sometimes kill their hosts?

It's bothered me for a while now. I understand why a parasitoid would do this, as it only temporarily requires the host, and that not all parasites kill their hosts. There seems to be no evolutionary ...
5
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1answer
157 views

What is this insect I found in Russia?

I found this in Russia. It is approximately 2cm long.
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0answers
39 views

why water is a proof of a life? [duplicate]

I read that NASA looks for water on Mars or other planets as a sign of a life. I wonder why scientists look for water as proof of a life? isn't there any animal that drinks another liquid like ...
3
votes
1answer
46 views

How diverse are dogs in their traits other than appearance?

I've asked this question about dogs not so long ago, and the short answer was - dogs are the most diverse looking species of mammals because they got a small number of genes that have a big impact on ...
2
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2answers
159 views

What insect is in this photo?

Found in Russia, in the kitchen. It is about 1–2 cm length.
3
votes
1answer
189 views

Has synthetic biology created new plants or animals as of 2013?

I've seen a Ted.com talk where the speaker suggests that modern science can create new micro organisms, like bacteria with a pre- defined new set of traits. But has anyone create a new species of ...
3
votes
2answers
395 views

Do primates other than humans have a consistent sleep schedule?

I'm doing some sleep research and would like to compare a human sleep pattern as recorded by a wrist-based actigraph with a "natural" sleep pattern, such as from apes. In an experiment like that, a ...
2
votes
1answer
93 views

Is there an instinct-driven body language for birds?

Over the last year or so, I've been observing house sparrows, because they are so prevalent in the northeast US cities. I noticed that a lot of sparrows, even in different cities seem to have very ...
6
votes
2answers
206 views

Is recognizing one's own mirror reflection a valid test of animal intelligence/self awareness?

I've been looking at this Ted talk on interspecies internet, and it appears that they have selected a small number of species of animals (dolphin, elephant, and some ape(?)) and are intent on ...
5
votes
4answers
360 views

Are there animals which can see movements better than shapes or colors?

I remember that in Michael Crichton's novel Jurassic Park, Tyrannosaurus Rex was supposed to have movement based vision. (Of course, that is a novel and not a scientific text.) I have also noticed ...
0
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1answer
30 views

Information and image of Genus Acesina

I am searching for image and information, like distribution etc of the genus Acesina. The Taxonomic tree is: ...
5
votes
1answer
366 views

What is this beetle and what are the strange antennae for?

I found this wonderful creature in my yard (I live in the south of France) last night: It was about 2-3cm long, with a hard carapace and wings. It also made loud hissing noises when agitated. I ...
1
vote
0answers
21 views

Living organisms with properties similar to both plants and animals? [duplicate]

Is there any example of currently living organisms that shows close resemblance to both being a plant and an animal? What is the plant with the closest possible resemblance to animals, and What is ...
2
votes
1answer
62 views

Aside from cockroaches and other insects, which species (of all kinds) are 'immune' to ionizing radiation?

I have just been reading this excellent question and answer about cockroaches ability to withstand ionizing radiation. My question is an extension of that question: aside from insects, which other ...
5
votes
2answers
853 views

What is dental health like in animals?

Do animals suffer from tooth decay, such as cavities? Is it to the same extent as in humans, or do animal teeth decay more or less? If teeth decay in animals as well, are there natural strategies ...
7
votes
1answer
255 views

What is the name of the appendage that mantis shrimp use to rub their eyes?

In this short clip, you can see the mantis shrimp using some sort of feathery arm/claw to rub its eyes. Looking at a diagram here, it appears possibly that it's using maxillipeds. Someone with ...
4
votes
1answer
98 views

How animals maintain their body shape after development to maturity?

I've recently read a book on evolutionary-developmental biology for laymen, and it described how a fetus is progressively divided into more refined zones of genetic activity. These zones, kinda like ...
4
votes
2answers
318 views

Is life expectancy linked to intelligence in animals?

For example, animals that live only a few days or a few years are often not very intelligent. In contrast, the most intelligent animals seem to live longer. Is this true? Are there any studies to ...
6
votes
1answer
692 views

Why does ostrich meat look and taste more like beef than chicken?

Some time ago I tasted ostrich meat, and what was amazing to me was that the meat very much resembled beef, much more than it resembled chicken, turkey or duck meat. And even more than lamb and pork ...
7
votes
1answer
1k views

Is it true that oral sex exists in non-human animals?

For example, outside of humans, do other species of animals engage in oral sex, or any oral stimulation of others' genitals purely for pleasure, not any cleansing habits, etc.? Basically, what I am ...
1
vote
3answers
245 views

What flying insect is this?

Found in Russia. Approx. 7 cm.
3
votes
3answers
958 views

Polymorphism in cnidarians?

To me, the phenomenon of polymorphism in cnidarians is particularly troubling. I gather that it essentially refers to existence of various different forms or kinds of individuals, i.e. zooids and ...
5
votes
1answer
133 views

Is there a DNA test to identify dog mixes?

We adopted a dog at the age of two. Our vet said it was a mix of an Australian Shepherd and Border Collie, which we've told everyone. Based on markings, I think it's likely. I am wondering, however, ...
2
votes
1answer
115 views

Can songbirds mimic car alarm sounds?

A silly question. A few days ago I observed a very vocal bird with impressive vocal variety. It was rapidly switching from one tune to the next. After sometime I realized that the bird might be ...