Questions tagged [zoology]

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

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37 views

How did brown bears and black bears evolve into separate species when they share the same habitat?

It seems that wherever brown bears are found, black bears are also found. So how did they evolve into separate species when they share the same habitat?
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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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Do sharks fart?

My son is 5 and I'm encouraging him to be curious and ask questions of the world around him. He asked if sharks fart and how does it smell? He feels that it would smell of fish and be disgusting. He ...
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2answers
845 views

Has autogamy been observed in any animals?

By my understanding, autogamy, i.e., reproduction that is sexual, but with both gametes contributed by the same individual, is not at all uncommon in the plant kingdom. Does this also occur anywhere ...
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1answer
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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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Do camels have nucleated RBCs or enucleated RBCs?

Most mammals have enucleated RBCs as an adaptation to facilitate the transport of oxygen. My text says that camels and llamas are exceptions to these. I was wondering why they are exceptions, and the ...
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1answer
55 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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What wide ranging outcomes would result from the extinction of a species? [closed]

I have been searching for a reasonable explanation of preservation of endangered species, and the search continues still. Apart from few redundant examples like bees or birds/animals taking part in ...
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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
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Identification of Bird feather, probably from a predatory bird

Found in Berlin,Germany Area of Charlottenburg I want to know the species of this bird, someone please tell me. Approximate size 19 cm
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1answer
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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
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Why Lungs can't work in water and gills can't work in air? [closed]

Animals with lungs (such as most terrestrial mammals) cannot breathe if submerged in water, and soon suffocate. Whereas, fish can variously breathe air (at least for few-hours, as some fish frequently ...
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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
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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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1answer
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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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What are the light spots on the hippo in this night-vision image? [duplicate]

On Netflix I watched a naturalistic documentary which has been filmed during the nights in various ecosystems. In one of the episods, a hippo is shown which has some light patches on the skin. What 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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Do animals exhibit handedness (paw-ness?) preference?

I have been observing my cat and found that when confronted with an unknown item, she will always use her front left paw to touch it. This has me wondering if animals exhibit handedness like humans ...
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858 views

Why is it called Nematocyst “Battery”?

I was reading an article on Hydra where they mentioned Nematocyst Battery. I know that Hydra and other Cnidarians have nematocyst but why are they called Nematocyst 'Battery'?
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Do carnivores know to not eat the waste inside the intestines of their prey?

For example, when a tiger kills a gaur he will eat the organs for sure. Does he know to not to eat the waste inside the organs? I see no benefits coming from eating waste, which is just grass anyways.
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Why do bees fly inside the gaps between the decoration on the exterior wall of a building and the wall?

My house has decorations around the windows on the exterior wall: There are gaps between those decorations and the bricks of the building: During the summer, there are always bees looking for those ...
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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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3answers
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Are there species that occupy several roles in the food hierarchy?

Are there species that occupy several roles in the food hierarchy? By role, I am referring to producer, primary consumer, secondary consumer, tertiary consumer, quaternary consumer and so on. ...
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1answer
56 views

Ways to identify/distinguish individual coyotes?

Are there any methods to distinguish individual coyotes from a distance (with a binocular or telephoto lens)? Are there marks or patterns we could be looking for? Similarly, if I have seen a coyote ...
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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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3answers
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What animal has the longest juvenile period?

I just heard the following complaint from a comedienne. Humans are the only animal that is completely useless for the first twenty five years of life. Obviously this is just a joke but it is true ...
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1answer
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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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898 views

What are these tiny creatures swimming around my aquarium?

I was checking out my aquarium today, and decided to scoop out a water sample and take a look at it more closely. What I discovered were numerous, very, very tiny white worms (?) swimming around in ...
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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
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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
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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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1answer
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Is urban beekeeeping harmful or are there good practices to follow?

I have found several newspaper articles on how good could be urban beekeeping both for the bees and for agriculture. Today I read this one: Urban beekeeping is harming wild bees saying that urban ...
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1answer
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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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1answer
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ID a shell from Puerto Rico

I recently found this in Rincon Puerto Rico on the beach. I assumed it was a baby sea turtle shell or some kind of turtle. Someone that frequents Puerto Rico said it was not. Does anybody know what ...
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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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4answers
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Why do men grow facial hair?

Ancestral facial hair. Our closest ancestors, the chimpanzee and bonobo, both grow facial hair around the mouth area. What is noteworthy is that this is the case in both males and females of the ...
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3answers
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Why is wombat scat (feces) shaped like cubes?

I've heard that wombat scat is cube shaped, but I don't understand how that can happen. Has anyone studied the phenomenon? What would the evolutionary pressure have been to cause this?
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Locomotion of Hydra: Why Somersaulting is better than Loop locomotion when moving to a larger distance?

In my text I read about different types of locomotion of Hydra where I learnt that generally Hydra moves by somersaulting and it is faster than 'Loop locomotion' which Hydra uses for moving to a large ...
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1answer
107 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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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
61 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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Why is the Red Fox colored bright orange?

They're not poisonous or anything, so it can't be aposematism. As far as I know it doesn't come from diet like the flamingo. They're not apex predators, so they can't get away with it (like tigers), ...
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1answer
1k views

What shape is the pupil of squirrels?

In the animal kingdom there is a striking variety of pupil shapes, with great variety among relatively close relatives. Cats have vertical slits. Siberian tigers have round pupils. Cuttlefish have a W ...
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1answer
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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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How does a bone know the final shape it has to attain (and then maintain)?

How do osteoblasts and osteoclasts share information with each other to maintain this shape?
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1answer
4k views

Larva in cat's water dish

Can anyone help me identify this tiny larva I found in my cat's water dish and tell me how it got there?
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1answer
70 views

Bed bug or booklouse? [duplicate]

I found this creature climbing on the lower part of a wall inside apartment. Can you distinguish if it's a bed bug nymph or a booklouse? Sorry the photo quality isn't great, because it's so small (2 ...
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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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