Questions tagged [zoology]

The biological study of animals. Very broad use so be sure to add additional clarifying tags

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22 views

What kind of insect cocoon is in the image below?

I found this cocoon under a leaf in my garden. It was light green when I found it, but it has turned to this colour after a while. I want to know what kind of insect's cocoon it is. I live in South-...
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What is this black worm-like creature with a yellow underbelly

This was found in the Malay Peninsula around noon. Unfortunately it was doused in hot water by my grandmother. Image below is after having been killed by hot water. It is about 1.5cm-ish long. It was ...
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1answer
37 views

Herbivore digestive System

Why do Herbivores have many different types of digestive Systems? for example a Rabbit has a mono-gastric Digestive system and a hippopotamus has a pseudo ruminant digestive system but they are both ...
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Does Hydra use nematocyst (glutinant) while climbing and walking locomotion?

I realize glutinant is used for looping and somersaulting, but does hydra use that glutinant or any part to nematocyst while climbing? If not, how does it strongly hold on to any object? I'm trying to ...
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1answer
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By what mechanism do cephalopods regrow limbs?

As far as I can tell, there are two types of limb regeneration: epimorphosis and morphallaxis. Epimorphosis is used by animals such as amphibians and various phyla of worms, while morphallaxis is used ...
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Identification of an animal building

I live in south-west Germany and today while mowing the lawn I discovered a strange structure. It looks like a molehill on which additional branches were placed. This kind of branches are easy to find ...
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Are there animals that usually sneeze with their eyes open?

As per title. I believe that most animals tend to sneeze with their eyes closed, but wonder if any normally keep their eyes open. Is it the case?
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1answer
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Are dragons real animals? [closed]

I'm having this debate with someone on whether or not dragons are real. They say they are real because there's been thousands of historical sightings of them, and there was at least one historical ...
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What kind of animals are these little creatures?

I have 3 tanks. 1 with my fishes and 2 other are technical. The smallest one is 0.5l and I'm using it as trash bin where I put dead plants and algae from main aquarium and it has sand from the see at ...
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1answer
43 views

What is this tiny bug [duplicate]

I have seen these on my floor several times now that spring has arrived and temps have started to go up. It is silvery in color, appears to have a hard and segmented shell, it kind of reminds me of a ...
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Can anyone tell me what species this baby bird this is?

Can anyone tell me what species this baby bird this is? He or she is less than two weeks old. Fell out of nest. He is doing well. I live in Sacramento Ca, Thank you.
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What is this snake in South Florida, USA

I observed this snake for about 10 minutes. It was slithering back and forth in about 50x20 yard (50x20 meter) area. Just kept going back and forth (then I left). There was a similar snake at the same ...
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1answer
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Probably a moth larvae but better to confirm [duplicate]

What I know, It reacts to light the red seems to be blood but can't say for sure 1 to 10 mm it has a casing of something soft fabric possibly it grabs to walls
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1answer
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Can hunting of large specimens of a species make the size and weight of the species tend to be smaller?

Siberian tigers in the wild don't grow as much as they used to be in past (in the 1900s). Their average weight was measured 176 kg in 2005 study. But it was also said that those tigers observed in ...
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How does a frog separate blood in its ventricle?

Since a frog has two atria and one ventricle, how does it separate oxygenated blood from deoxygenated blood when both are mixed in the ventricle? Or does a frog simply pump a mixture of both to the ...
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Do “shooting” animals exist?

The well-known cartoon imagery of porcupines shooting their quills at opponents in a fight is just that: a silly cartoon concept that isn't real. But it makes me wonder, does that mechanism exist ...
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What is the water content of avian blood?

I'm doing a work about heavy metal contamination in seabirds. I have found that the toxic threshold for Cu in blood is 1,15 μg/g wet weight. That number refers to an average between some seabirds. I ...
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1answer
84 views

Can anyone identify this spider? (greater Poland region)

This is in Poland, in the Greater Poland area, found a few days ago by a garage in the city. I didn't have any coins on me to give a sense of scale, but the body is roughly 1.5cm long. It was dead ...
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1answer
56 views

Do bears have killer instinct? [closed]

For example, all big cats have killer instinct. They go straight for the throat or neck of their prey, killing it before consuming. I've seen videos of bears and wolves hunting prey. I've never seen ...
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Is it true that oxygen levels in water limits fish size?

This answer says that breathing water is inefficient, and that may act as a limiter to the size of fish. I've heard this in a couple of other places as well, but cannot recall the sources. However, ...
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1answer
68 views

Is human zygote unicellular or multicellular [closed]

Is the human zygote which is formed by fusion of sperm and egg a unicellular structure? Bcz at some places the 2 celled stage which is formed due to cleavage has been labelled as the zygote. So is the ...
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1answer
51 views

Can animals speak like humans?

I know some animals don't have the required vocals. But, I do think that some like parrots, etc may have the capability to produce speech and talk just as we do. My question is that if an animal is ...
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Do penguins “test the ice”?

Do penguins have a way to test the ice that they stand on to ensure that the ice will not break? In other words, do penguins make sure that they will not fall into the ice before stepping onto it? I ...
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1answer
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How to convert a genus name to a noun or adjective

Consider the crayfish family Cambaridae. As I understand it, this familial name can be turned into an English noun or adjective by changing the first letter to lower case and dropping the "ae.&...
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What is this spider found in Brittany?

I found it in Brittany, in my kitchen. It was about 3cm in width and 5 in length. Is it dangerous ?
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What are the effect of radioactivity on grey wolves in Chernobyl?

I am doing some research about the effects that radioactivity has and is having on grey wolves in Chernobyl and more particularly on their genetics, but maybe also looking at the populations in the ...
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1answer
155 views

How does the social structure of lion prides prevent incest?

I assume that lions don't have a concept of incest and they will just mate with any adult lioness in heat, daughter or not. If so, is incest inevitable as the female cubs will grow up and remain in ...
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125 views

Are the “cocaine hippos” suffering from noticeable inbreeding depression? [duplicate]

Colombia has a population of about 100 "cocaine hippos" founded from a group of one male and three females, which escaped from a drug kingpin's private zoo; it's even estimated that this ...
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1answer
166 views

How did animals on Earth survive without plants?

Around 500 million years ago, there were animals on earth, but there were no plants yet. How did animals survive? I'm assuming some of the animals ate other animals, but did some animals eat rocks or ...
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6answers
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Why didn't Escobar's hippos introduced in a single event die out due to inbreeding

Today I read a BBC Report about how Pablo Escobar had once imported 4 hippos (1 male, 3 female) into his estate in Colombia for his private zoo. After his downfall, while other species were shipped ...
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1answer
134 views

Do animal muscles atrophy slower than humans?

Suppose I consider the silver back gorilla as an example. I cannot imagine ever seeing one in the wild intentionally doing something akin to weightlifting like humans solely for the purpose of ...
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1answer
68 views

If you only ate fruits, vegetables or smoothies would you be able to skip drinking water?

If you only ate fruits, vegetables or smoothies would you be able to skip drinking water? I do not see some animals (like squirrels) drinking water daily (doesn't mean they don't have a water source) ...
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Characteristics of 'true' tissue

Why are sponges not considered to have tissue level organization? Quite a few places seem to say that sponges do not have 'true tissue' and only have specialized cells. Unlike Protozoans, the ...
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How do tardigrades defend themselves from predators?

Tardigrades or water bears are well known for their ability to enter into a cryptobiotic state which allows them to survive extreme environmental conditions such as extreme temperatures or radiation. ...
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1answer
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Why do insect legs look so different from mammal legs? [closed]

Why do insects (and spiders and centipedes) have legs that are angled acutely upward then downward to meet the ground whereas mammals large and small all have straight legs that curve only slightly ...
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1answer
62 views

The Perfect Predator? [closed]

I’m not a biology major or even studying it in any way so I apologize if this makes no sense. I’m curious, if say the Jurassic Park team came up to you and asked you to genetically engineer the ...
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1answer
19 views

When should I use cryofixation and chemical fixation?

We know that the technique used in TEM sample preparation involves multiple steps, one of the most important of them is fixation. Fixation can be of two types: Cryofixation, that suggests that the ...
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1answer
108 views

What kind of salamander is this?

This guy was found in central Virginia, under a flower pot. He's about 3 inches long, because part of his tail is either missing or it's just short. He looked dried out, so of course I wet my hand, ...
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23 views

How does a bone know the final shape it has to attain (and then maintain)? [closed]

How do osteoblasts and osteoclasts share information with each other to maintain this shape?
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Have scientists tried to communicate with Sperm whales?

I see lots of passive studies of sperm whale click "language", usually focused on fingerprinting to identify groups and individuals. There's application of deep learning, and all sorts of ...
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2answers
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What species of duck is this?

What species of duck is this? See below photo. Head colour is green like a mallard, but that's pretty much the only similarity. Spotted in Leicestershire, UK.
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What is this worm like animal found on a well water filter?

This was found in the water filter on a private water well that feeds a house in southeast Colorado, USA. The well has hard water, and is shallow (25’). There are several of these creatures all over ...
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What mammals can rotate and move their ears the most?

I found out that rabbits can rotate their ears 270 degrees, and also move them up, down and independently. Are there any other mammals that can control their ears' position that well, or even better?
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Why mammals don't have renal portal system

I am a high school student and I am a little confused why mammals don't have renal portal system?, some books says that because we have four chambered heart, so our blood is filtered more effectively ...
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Infectious deadly disease among free animals?

Sorry for the presumably naive question, I'm not a biologist and searched for that but didn't find a clear answer to this question. What I would like to know if deadly infectious diseases are common ...
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36 views

WC small organisms ID?

I have reached the end of my Winogradsky Column experiment, but out of interest I have kept them for a little longer. I have noticed small bug- and worm-like organisms appearing in some of my columns. ...
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38 views

Why do wasps (Vespula vulgaris) build a new nest every year?

I have been searching it for a while, and i haven't found an answer, why do common wasps (Vespula vulgaris) create a new nest every year instead of using the previous one if the old one is still ...
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1answer
91 views

Spontaneous generation of fruit flies

I live in the South of England. It is currently winter. Whenever I buy bananas, even one, if I leave the discarded banana peel in my kitchen, within hours or even minutes, there is a cloud of little ...
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54 views

Why is the spinal cord shortened in some vertebrates (cauda equina) but not in others?

Hodos, 2009, mentions that the "spinal cord tail" that humans have is not present in most vertebrates. This page mentions cauda equina is not present early on in human embryonic development, ...
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1answer
37 views

How many hairs per sq. cm. (or inch) do hamsters have on average?

How many hairs per square centimeter (or inch) do common pet hamsters (Mesocricetus auratus or Phodopus sungorus) have on average? I thought this would be easy to find by googling, but the best I've ...

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