The biological study of animals.

learn more… | top users | synonyms (1)

0
votes
0answers
70 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 $V_E$ ...
1
vote
3answers
534 views

Are domesticated animals really “more intelligent,” or is that a myth/misunderstanding?

Often do I hear people speaking of how the domestic house cats are more friendly, less ferocious, less savage-like, and smarter and/or than their distinct but equivalent feline-species friends, like ...
3
votes
1answer
1k 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' ...
4
votes
1answer
356 views

Body size, what are the evolutionary trade-offs?

Background Considering just the "Kingdom Animalia" branch of organisms. It is clear that bigger does not necessarily mean better - there is large variation in body size... From the 94 µm long ...
9
votes
1answer
266 views

Are there specific features of birds that cats/small predators are attracted to?

I've recently heard a podcast, in which a professor describes one of the theories as to why we like abstract art. In his talk, he mentions an experiment with seagull chicks, in which the seagull ...
8
votes
1answer
2k views

Can a human acquire a memory of an animal? [closed]

I would like to know if it's possible for a human to acquire an animal memory. I mean, animals store their memories in their brain, right? And so do we, humans, store our memory. So, is it possible ...
2
votes
1answer
2k views

List of Asymmetric Animals

The (male) Fiddler Crab is a famous example of an animal whose morphology exhibits neither mirror nor radial symmetry: (Image source) List of animals featuring external asymmetry is a Wikipedia ...
0
votes
0answers
30 views

Are there any mammals whose males can feed with milk? [duplicate]

Are there any mammals whose males can feed the offsprings with milk from the breasts?
5
votes
3answers
427 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 ...
3
votes
1answer
263 views

Why do chameleons move back and forth?

I was always curious, why do chameleons have this strange gait?
2
votes
1answer
64 views

Why did many odd-toed ungulates become extinct?

There were a lot of odd-toed ungulate animals in the ancient times but now just few of them survived. What is the reason for that?
4
votes
2answers
75 views

Do mosquito repellent sprays work on all insects?

I would like to know the mode of action of mosquito repellent aerosols. Are these specific to mosquito or are other insects affected too?
3
votes
1answer
92 views

What kind of animal can do this?

When I was moving to another house, I found this plastic bag on the top of the cabinet of my old house. It looks like someone cut it all with a scissor, but no one have access to my bedroom, and it ...
7
votes
2answers
2k views

How do marine mammals control buoyancy?

Presumably, as a whale or seal dives, its lungs get compressed by the increasing water pressure, and it gets less buoyant. Under this model, for a given amount of air taken in at the surface, the ...
1
vote
2answers
190 views

Animal swimming styles

Can a frog swim on its back, or it can use only the classic frog style? Does any (not specifically marine) animal exist with many different swimming styles, just like humans?
5
votes
1answer
1k views

Are fish and reptilian scales homologous?

Wikipedia: Fish scales are dermally derived, specifically in the mesoderm. This fact distinguishes them from reptile scales paleontologically. So aren't reptilia scales also dermally derived?
0
votes
1answer
63 views

About the plight of Elephants and efforts to conserve them? [closed]

Poachers are only after the ivory horns right? I read this story from the New York Times ( I think) of saving a Rhinocerous by some Park Rangers and a Vet. ( forgive spelling) ; they tranquilized the ...
3
votes
1answer
95 views

How are chickens affected by light?

When I was young, I was told never to put a fluorescent light in a hen house because it continuously turns on and off. Extra lighting is used, as far as I know, to 'extend' a chicken's day. Human eyes ...
3
votes
1answer
104 views

What insect is this on the photos?

What insect is this on these photos? Found in Russia in the living room.
1
vote
0answers
44 views

Why are there no animals with a length greater than 30-40 meters or with a mass greater than 200 tonnes? [duplicate]

The biggest and heaviest aquatic animal is the blue whale: 30 meters long and a mass of 200 tonnes. The biggest and heaviest terrestrial animal was a Sauropod (plant-eating, long-necked dinosaur): 40 ...
2
votes
1answer
107 views

Book-recommendation: Ethology

I am looking for a book that covers the following topics in ethology: Behaviour Sensory filtering, reponsive-ness, sign stimuli, learning and memory, instinct, habituation, conditioning, imprinting....
14
votes
2answers
2k views

How do insects breathe?

Do ants even breathe? If they don't, how do they stay alive? On what resources do they depend upon to stay alive? How are they different form mammals?
0
votes
2answers
549 views

Why can we breathe only oxygen?

Plants has the capacity to take in both CO2 and oxygen, that's during day CO2 and at night oxygen. Why don't humans have such a capability?
5
votes
2answers
356 views

Why do small organisms make faster movements than big organisms?

I hesitated to ask this question because it seems so obvious and intuitive. However, I am not able to explain this tendency. Background It seems to me that small organisms make faster movements than ...
7
votes
1answer
151 views

What is this woodlouse doing?

I picked an apple from the ground, it was wet with dew and a woodlouse was stuck to it, with its back against the apple. When it got loose, it started flexing its "tail" like this for a while. Why?
6
votes
1answer
200 views

Cross-integration of puma subspecies populations

A major concern of conservationists in south Florida is the population of native Pumas, the Florida Panther. Until recently, it was thought that the Pumas were a genetically distinct subspecies, ...
7
votes
1answer
180 views

Help Needed Identifying Corvids

I'd appreciate some help identifying these three corvids I photographed in Austria during the Summer: I know identifying corvids can be difficult, I'm not an ornithologist, just an amateur bird ...
4
votes
1answer
361 views

How do animals lose heat?

I remember being told as a child that dogs stick their tongue out to stay cool, because they can't sweat like us. This made sense to me. But only a couple of days ago I suddenly thought: What about ...
5
votes
2answers
3k views

Do octopuses have better eyes than humans?

I've read that unlike humans, octopuses have eyes "designed" the "right way", i.e. with the nerve fibers behind the retina, thus getting rid of the blind spot we humans have as well as theoretically ...
4
votes
2answers
2k views

Can ants sense food from a long distance?

I recently had ants find and then swarm to a food container that I put down on a desk, and I'm curious as to whether an ant would have needed to get lucky, discovering the food after crawling up the ...
6
votes
1answer
652 views

Excretion of small kangaroos while in the pouch

How is the excretion of small kangaroos done when they are in the pouch of their mother, fastened onto her teat? My question is what happens with the products; do they accumulate in the pouch?
2
votes
2answers
63 views

Where I can find information about the study of animal vision?

I read a lot of articles on the internet about how dog see the the world. But I can't find the source of these study. I want to know how did scientist setup the experiment to find out animal vision. I ...
1
vote
1answer
36 views

Do snail shells increase the number of rounds with age?

Do snail shells increase the number of rounds with snail age?
10
votes
3answers
114 views

What is the smallest scale at which blood vessels, nerves and other structures are deterministic?

Super simple question, but I can't find the answer on the Internet (and I'm in a foreign country so the library is not English.) As the title says, what is the smallest scale at which blood vessels, ...
13
votes
1answer
2k views

Is there any relationship between heartbeat rate and life span of an animal?

Is there any relationship between heartbeat rate and life span of an animal? Do they belong to a cause-and-effect relationship or are they both caused by some phenomenons or a common cause?
2
votes
2answers
242 views

What does this Barbary Macaque facial expression mean?

A girl pretended having a piece of food in her hand and pointed it to a Barbary Macaque in Gibraltar. As a response he made this facial expression to her. What does this mean?
3
votes
1answer
146 views

Book recommendation on selective breeding?

I am looking for a good book that gives a nice overview of the science and technics of selective breeding. I am particularly interested in the use of population genetics to support decision in this ...
5
votes
1answer
847 views

Help me Identify this Spider

This red spider has set up a web in my yard, in South Eastern, Texas, United States: The spider itself is about an inch long (2.5 cm), and is predominantly red to brown in color, with red legs, and ...
2
votes
1answer
109 views

Leaves not liked by herbivores

I at times have many goats grazing in our locality. Recently a few cows were seen too. I just offered one of the cows a few leaves from Jasminum sambac plant growing in our garden. The cow smelled and ...
2
votes
0answers
74 views

What fraction of biomass is cultivated by humans? Have we increased the number of large animals?

What fraction of "large animals" are domesticated by humans, compared to those who are wild? I mean cows, pigs, sheep, horses, dogs, cats in relation to comparable wild animals. Different measurements ...
8
votes
1answer
516 views

Do non-human animals suffer from insomnia?

And how do we know whether they do or not? § If sleep is a physiological need, it seems weird that we become unable to fulfill on demand even in the absence of any obvious physical issues. We would ...
4
votes
2answers
243 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
1answer
3k views

Why do humans seem so much more prone to disease than animals? [closed]

It seems like when we observe animals in the wild, the occurrence of noticeable disease in adult individuals is much lower than in humans. Why? There are a number of reasons that this could happen, ...
12
votes
1answer
904 views

What kind of skull is this?

We found this skull on a beach in southwestern Sweden, and are curious as to what kind of animal it was.
4
votes
1answer
653 views

Will a completely removed cat whisker grow back?

I just accidentally pulled out, while playing, my cat's whisker entirely, follicle and all. I feel terribly as I know she is a kitten and whiskers are rooted deep in a place rich in nerves. I'm ...
5
votes
2answers
201 views

What's the smallest organism that can produce voice? [closed]

What's the smallest organism (animal, insect, or any living creature) that can produce voice. And not just make sound, but has an organ to specifically to create sound, like how us mamals have vocal ...
4
votes
1answer
99 views

Why do insectivorous birds migrate?

Living in northern latitudes, I have always wondered why do migratory birds invest so much time and energy to travel twice a year the vast distances between their breeding grounds and wintering areas. ...
5
votes
1answer
91 views

Burns' “To a mouse” - what species of mouse?

What's the most likely mouse species Robert Burns is referring to in his poem "To a Mouse, on Turning Her Up in Her Nest with the Plough". Burns farmed near Ayr, which is on the Firth of Clyde in ...
5
votes
1answer
314 views

Why are there so many sex determining systems in animals

There are several sex determining systems in animals. In mammals XY = male(except in rare cases where SRY crosses with genes on the X so that it is the reverse) and XX = female. In some birds it is ...
1
vote
1answer
516 views

Identifying structures from anterior end of dissected prawn

Note: This image might be disturbing. I want to know what the red and the black structures (directly posterior to the red structure) are. I guess it's the heart.