The biological study of animals.

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Zoology - Help identify the kind of spider

Yesterday, I bought a banana tree (Musa Basjoo) from a local supermarket. Today, I noticed a hive of small spiders on the tree. I do not know where they came from, so I am curious to identify these ...
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30 views

What is the difference between pianka's index and renkonen index? [closed]

Why do Pianka's and renkonen indices give different results, even though they are both meant to measure overlap and similarities?
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2answers
90 views

What is the convention for log notation in biology?

I'm reading through some oldish (1980s) papers on length-weight relationships in fish and crustaceans. Many report log-log relationships without specifying whether this is natural log, base 10, etc. ...
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1answer
48 views

Why are Oxyuranus snake species named Taipan?

It is interesting, why are Oxyuranus species called Taipan. The snakes are Australian but taipan looks like of Chinese origin word (it means big shot - important person).
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1answer
23 views

Are there fish with a double circulatory system?

Our courseware materials say there are such fish, but the internet suggests fish only have a single circulatory system. Thanks!
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47 views

Consuming animals by slaughtering vs injecting barbiturates?

In "Least painful way to die" we get an answer ... Companion animals (e.g., dogs and cats): injected barbiturates are recommended Laboratory animals (e.g., mice and rats): injected ...
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1answer
39 views

Limited space for animals - how is that bad?

I am writing an English paper wherein I have to appeal for change in the way humans treat wildlife. I was initially given a situation wherein I took a ferry in a certain area and saw a dead baby ...
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20 views

Animal counterpart to global seed vaults

Is there a global 'animal' embryo bank (or something similar to it) like the Svalbard Global Seed Vault for plant life? I don't mean 'gene' banks because they are not as 'useful' as real seeds are. A ...
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1answer
84 views

Does the DNA of a tadpole change after it becomes a frog?

Does the DNA of a tadpole change after it becomes a frog? In other words what changes take place as a tadpole becomes a frog, and does this metamorphosis affect the DNA in any way? I would appreciate ...
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1answer
60 views

Human bone density and Brown Bear bone density?

It is stated on this website that the density of a Grizzly bear bone is ten times our own. And since I am not into biology at all, I am confused as I don't understand the meaning of bone density here. ...
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2answers
405 views

Did cats evolve from monkeys ? or vice versa?

Did cats evolve from monkeys ? or vice versa ? How similar are the genes of cats and monkeys ? What is the proof that they are related or that they are not related ? Most monkeys climb in trees and ...
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1answer
35 views

Do “non-human” animal like cat, dog, bird or fish think about future while sleeping? [closed]

I don't think "non-human" animal like cat, dog, bird or fish think about future while sleeping. I think when sleeping, the "non-human" animal will feel rather think about anything. I think when ...
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2answers
109 views

What is this bug?

I recorded a video of this bug: https://youtu.be/0eoWfHLEo7A I counted 8 legs, the front legs are a little curved. The drawing on the flat back is dark and looks like the image of Jesus with some ...
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40 views

Mosquito physics

What are the environmental limitations of mosquitos I should know of if I want to avoid getting bitten? For example: How fast should I walk in order to be moving too fast for one to bite me? Can a ...
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1answer
400 views

What produces the strong odor of decaying dead animals?

Are there specific chemicals responsible for producing the strong, putrid odor that is present after an animal deceases? Also, how long does this odor last?
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1answer
29 views

Why are killer whales found in the Gulf of Mexico smaller than ones found in the Pacific?

I recently found out that there are killer whales that live in the Gulf of Mexico, but they are smaller than killer whales that are commonly found in the Pacific Ocean. Why is it they are smaller in ...
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1answer
26 views

Cysticercoids of Eucestoda

I have found the following pictures representing cysticercoids of Eucestoda. If I correctly understand the right part of the picture, I would say that the development of the scolex is portrayed on ...
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2answers
78 views

Horns in animals and birds [closed]

Are there any carnivores with horns (whether extinct or currently alive)? Do any flying creatures have horns? By horns I mean horn like structure.
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24 views

Founders of Cnidarian colony

I know that colonial Cnidaria enlarge their colony by the means of asexual reproduction and sexual and asexual reproduction can originate individuals that will be part of other colonies. ...
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2answers
1k views

How do birds deal with their eyes drying out at high speeds?

My eyes tear up when cycling at 15 mph, which is nothing compared to bird airspeeds. Do birds continuously produce lots of tears and blink a lot, or do the eyes self-moisturize from the inside ...
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62 views

How did birds become so intelligent?

I have seen a Discovery Channel video of a bird throwing stones in a pot to raise the water level so it is able to reach and drink it. A similar experiment in this paper from Current Biology shows ...
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3answers
57 views

How animals know which is carnivorous and herbivorous?

Deer ran away from tiger or cheetah, but not from giraffe or zebra. where did deer learn this? How animals know which is carnivorous and herbivorous?
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1answer
129 views

Help identifying what this is in Crayfish gills?

this is my first time posting here. I was in my Zoology lab doing a dissection on a Crayfish when I noticed these hairlike structures within the gills. They were very "snappy" and fine, and would ...
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1answer
122 views

Why are butterflies drinking blood?

According to this video, butterflies sometimes drink blood. Do they have the organs necessary to digest blood? I thought they eat only salts and nectar, which are easy to digest compared to proteins. ...
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1answer
57 views

Why do insects avoid being on their back?

I have noticed that when insects are placed on their backs, they tend to turn themselves over quickly or else appear to be in distress. Is there a physiologic, anatomic, or adaptive reason why supine ...
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2answers
78 views

Do other animals have different blood types?

Humans have the ABO and Rhesus blood typing systems. I have two questions about it: Why have we evolved these blood types? Do other animals have different blood types as well?
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1answer
81 views

Why does cucumber skin kill ants?

I recently read that cucumber skin is an effective repellent for some ants: Set out cucumber peels or slices in the kitchen or at the ants' point of entry. Many ants have a natural aversion to ...
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1answer
82 views

What will happen if a scorpion pierces itself?

If a scorpion pierces itself, will it die or immune to its poison? If it produces the venom its blood should be immune to itself poison.
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1answer
59 views

(Why) are polar bears more common in Labrador than in southern Greenland?

The Labrador Sea is between Greenland, Labrador, and Qikiqtaaluk: Map source. A Greenlandic source on polar bears states: In Greenland the polar bear lives and breeds in the northernmost parts ...
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3answers
751 views

Are there cats with black skin?

Some mammals can have a black, pink or spotted skin, depending on race - see for example humans or pigs. But I recently learned that this is not the case with mice. Even black furred mice have pink ...
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1answer
39 views

Detailed mechanism of the cause of diabetes mellitus type 1?

I have read in some texts that diabetes mellitus type 1 is caused by degeneration of beta cells due to our body's own immune reaction.Is it true? Can you explain further how are such types of immune ...
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2answers
259 views

How can we know or measure pain in animals?

Is there any standard way to know how much pain an animal feels when it gets hurt like when a bird loses it's wing or hen when killed etc. All pain sensation points? Hey I'm new to biology. :)
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95 views

What is called the “area size that an animal usually lives in”?

What is called the "area size that an animal usually lives in" or "needs for a normal life"? Is there any specific term?
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1answer
77 views

I found these skulls in a old bottle in the woods. Can you tell me what they are?

Can you help me identify these skulls I found in an old bottle in the woods?
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1answer
63 views

How can a drone be male?

A drone bee is male and is the product of only a queen bee. How is it that the drone bee can be male. I know that a drone is produced by an unfertilized egg, but this does not explain where the two X ...
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116 views

Do animals exist which have great vision, but see only grayscale?

In computer vision the color information is often discarded, as most object recognition tasks seem to work just as well on the greyscale image (even better, because there is less unnecessary ...
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1answer
44 views

Can anyone identify the worm in this video clip?

My wife came across this youtube clip of a spider and a worm. Can anyone identify at least the phylum?
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199 views

What is a group of tortoises called?

This post at Mental Floss stated that a group of tortoises is called a 'Creep'. I had never heard of that before, and in trying to find the references for the name, I was surprised that I couldn't ...
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1answer
112 views

How do cats survive falling from great heights?

Among mammals, cats are able to land safely when falling from great heights. For example, when compared to dogs or humans they can survive drops from relative large heights. How do they manage? A ...
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1answer
48 views

Was Earth's atmosphere more buoyant in the prehistoric era then today?

The mass and size of the dinosaurs and prehistoric insects continues to amaze me. I read from an earlier post that oxygen was more abundant during the prehistoric era. However supporting the weight ...
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1answer
40 views

How can I isolate live Wolbachia endosymbionts from Drosophila [closed]

I am interested to culture Wolbachia bacteria in cell line.
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2answers
161 views

Can canines communicate with each other using gaze direction?

After researching why humans have white scleras when most primates have dark scleras, I stumbled upon the cooperative eye hypothesis. It proposed that white scleras may have evolved on behalf that it ...
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3answers
3k views

How much energy does a lion contain? [closed]

I was looking into the following problem: Obviously, the solution lies in how much energy either can output per unit of time. The total energy output of the sun is $3.8×10^{26} \frac{J}{s}$. The ...
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1answer
68 views

Chickens roosting, is it sleep or torpor?

At night when they roost, do chickens experience a state of sleep (meaning do they move from NREM1 to NREM2, NREM3 and REM) or are they in a state of torpor (reduced metabolic rate and decreased ...
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3answers
499 views

How many cells does the smallest animal have?

Note: question rewritten to prevent misunderstanding and make it more answerable I know that some small animals like C. elegans display surprising sophistication with a very small number of cells. ...
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1answer
165 views

Do species other than humans have distinct daily feeding patterns?

I have a general interest in complex adaptive systems and I have found that nature and the organisms within it is a perfect natural case of a rich adaptive system with a lot of possibilities for ...
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1answer
37 views

Why are canines not nauseated by similar foodstuffs/state of decay as human beings?

I am continually surprised at the items my pet dog is willing to ingest. I understand part of the consumption is driven by nutritional instincts (licking salty liquids such as sweat) or nurturing ...
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71 views

The skin color of bonobos

Why is that bonobos skin color on the areas not covered by hair are dark throughout life unlike the chimpanzee?
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3answers
183 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 ...
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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 ...