The biological study of animals.

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Body part in motion after decapitation?

I'm sure following video is totally different than of other mammal after their body parts decapitated. In this video apparently, the snake is cut into three pieces. But when we look closer to the ...
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3answers
149 views

Do any amphibians start their lives on land?

Most amphibians - at least, all the ones I know of - start their lives in the water (at least, after they hatch). They then spend time maturing before venturing onto land, where they can breed. The ...
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39 views

Are there insects who can or try to avoid colliding with raindrops?

Some insects are very fast. Does this mean that they are capable of finding a way through falling raindrops without getting wet? Probably they don't do that at all, because riding on a bike or in a ...
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1answer
102 views

Can kit foxes and red foxes produce offspring?

Can a kit fox (Vulpes macrotis) and a red fox (Vulpes vulpes) together produce offspring? Would such a hybrid be fertile?
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2answers
8k views

Who are humans' closest relatives, after primates?

This question here addresses the controversy of whether humans are more closely related to bonobos or chimps. My question is - which group of animals are are closest relatives, beyond primates? Or ...
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2answers
311 views

Can animals like squirrels leave “gifts” or tribute for humans?

I've heard anecdotal reports of squirrels bringing up gifts to a person's house after that person left out food for them. Sounds bizzare and unbelievable, until I actually saw some kind of a nut right ...
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1answer
71 views

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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2answers
526 views

What makes an animal/species suitable for domestication/training?

Humans have domesticated all manner of creatures during the course of their civilization - dogs, horses, several types of cattle, varieties of birds, and perhaps others too. A prerequisite for an ...
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3answers
318 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
20 views

How many cells does the hermaphrodite version of Caenorhabditis elegans have? [closed]

Wikipedia states: The male C. elegans, for example, has 1031 cells How many cells does the female version have?
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1answer
43 views

How to compare diversity between different ecosystems?

I've used the Shannon Wiener Diversity Index for a single ecosystem (species as categorical variables). Do you know any alternative indices, especially ones that compare diversity between different ...
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1answer
109 views

Has the human body the greatest total length of nerves of all animals?

I've read that a human body contains about 150,000-180,000 km (Pakkenberg et al., 1997; 2003) of nerve wiring in the whole body. But does this length increase with the size of the animal? For example, ...
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1answer
94 views

Species identification - greenish blue ocean worm (nudibranch?) in Perhentian Islands, Malaysia

We found this on a beach at the Perhentian Islands, Malaysia in March, 2016 and cannot identify it. It's some sort of worm-type creature with many legs and bluish back about 15cm long. The legs ...
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1answer
34 views

What do red ants secrete while marching in a line, one after the other?

Red ants often move in a group, and seem to follow a trail one after the other. Once, I rubbed a part of the path along which they were moving and surprisingly found that the successive ants roaming ...
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1answer
7k views

How many mice are on the Earth?

We are 7 billion human beings on the Earth. But how many mice are there? How would you estimate such a number?
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3answers
699 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
60 views

What are these curious cetaceans?

At the beginning of the superb documentary film “Un jardin d’Eden sous les mers” (“A garden of Eden under the seas”) [1], we see a group of curious cetaceans. At about 1 min. What are these ...
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2answers
3k views

Do homing pigeons fly straight home or follow certain “highways”?

Homing pigeons (Columba livia) have been prized for their navigational abilities for thousands of years. They’ve served as messengers during war, as a means of long-distance communication, and as ...
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1answer
108 views

What happens to a snail if we cut off its antennae?

First off, I don't know why snails have antennas. Are they eyes? And what if we cut those antennae off? If they are like eyes, could a blind snail survive somehow?
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1answer
141 views

What is the scientific and common name of this bug?

Captured this under my stereo microscope. Much beautiful than appearing on my camera sensor. Can someone help me identify it and explore more? Also is it having a compound eye ? Location: New ...
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1answer
37 views

Why can one swim longer underwater by blowing out air?

I am a human. I take a deep breath. I swim underwater... After some time, I need to blow out some air. I blow out some air... By doing so, I can swim underwater longer. Blowing out some air gives me ...
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2answers
118 views

Skull mystery on beach

The skull was found on a beach on the Sechelt inlet on Canada's pacific coast. A marine environment. What species is this skull from?
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0answers
34 views

Do other animals have similar blood types to humans? [duplicate]

I am interested to know if there are any animals having blood groups similar to human blood groups? Is it possible to transfuse blood between humans and those animals?
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2answers
320 views

Can someone identify this bird?

We recently found a nest in the back garden and a little bird inside. Can you help us identify it? The nest is quite small like the bird so we are wondering whether this is the parent or a baby chick. ...
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1answer
88 views

Cockroach-like insect identification

I just saw an insect in my room, and I have never seen anything like it ever before. I captured a photo, please see if you can identify it. It has got quite unique colours on its exodermis and it has ...
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4answers
3k views

Why do smaller mammals move intermittently?

I was watching a nice little video on youtube but couldn't help but notice how snappy smaller animals such as rats and chipmunks move. By snappy I mean how the animal moves in almost discrete states ...
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1answer
1k 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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21 views

Would a python die if it ate a cane toad [closed]

I was thinking about the Burmese pythons that are invading the everglades and cane toads that were introduced in Australia.
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188 views

What traits make mountain goats so well adapted to mountain living?

I've never really understood how mountain goats manage to survive so well in mountainous regions. I've seen them scale almost sheer cliff faces with apparent ease, and they can almost sprint ...
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101 views

Chart of blood pH across different animal species?

How does blood pH vary across species? I can't find an article or chart listing this kind of information. So far I've found bits and pieces like: Human blood pH is nominally 7.4. 7.4 seems to be a ...
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1answer
209 views

Why are plants classified in living things? [closed]

@Volunteers Beware that I am none of the biological magnates. Nor a philosopher. This is just a sign of curiosity. And, I want only an intuition that enables me to see the difference. As far as I ...
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1answer
46 views

What do “reduced antipredator defense” and “reduced antipredator vigilance” mean?

The book BIOMAT 2010 (International Symposium on Mathematical and Computational Biology, edited by Rubem P. Mondaini) mentions the terms reduced antipredator defense and reduced antipredator vigilance....
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2answers
55 views

Identification of this species of Toad

I found a short -- 20 second/s -- video on the Internet of a toad and I wonder if anybody could identify it? Here is the hyperlink; http://weloveshortvideos.com/post/132047898162 It was posted on a ...
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1answer
75 views

Is a bone marrow transplant limited by sex?

Can a female patient get transplanted with bone marrow of a male donor and vice versa?
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1answer
200 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 (a)...
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Germ layer and platyhelminthes

Some introductory biology textbooks state that sometimes the body cavity is formed from pouches pinched off from the endoderm. So, I am interested in understanding what 'pouches pinched off' actually ...
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1answer
114 views

If birds are dinosaurs, then are mammals reptiles?

I'm just curious - it seems generally accepted that birds are dinosaurs. If that's the case, then can we call all mammals reptiles? Can we go even further and call humans amphibians? And since single-...
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54 views

How do animals with fur get enough sunlight to produce vitamin-D? [duplicate]

How is vitamin D synthesized in animals with fur; how do the cells get enough sunlight? If vitamin-D cannot be synthesized because of limited sunlight reaching the skin, do these animals have to ...
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1answer
174 views

Anatomical differences between herbivores and omnivores [closed]

What are differences of herbivores vs omnivores? I do not mean dietary differences (obviously), but physical ones. E.g., afaik herbivores have a much longer digestive tract than carnivores; then ...
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0answers
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Why does the doves coo suddenly stop? [closed]

Doves seem to always repeat the same sequence of coos in their call. I noticed around 3 x 5 coos but they always add one final coo at the end. Is there a (known) reason for this?
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4answers
7k views

Which organs do cats not eat on their prey?

My female cat is a very active hunter and brings me her prey daily. Except for shrews and birds, she always eats them entirely. This afternoon she brought me this: It was quite large (maybe ...
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Does urchin metamorphosis involve two animals?

An urchin larva becomes an adult urchin through metamorphosis. This fascinating documentary about metamorphosis suggests that the urchin larva "dies", being partially eaten by the new individual, the ...
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1answer
75 views

What were the main discoveries in Biology? [closed]

What were the greatest achievements in Biology? Can you please provide a short list of discoveries that you would consider as being the most important discoveries of the history of Biology.
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1answer
149 views

Why are cancer rates low in large animals?

Large animals generally have more cells and live longer than smaller animals. For example, bowhead whales live up to 200 years and weigh up to 100 tonnes, as opposed to humans (living ~71 years and ...
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2answers
108 views

Would a colony with only one male and female collapse?

This is a thought experiment: If we form a population with only a single founder pair, can this population survive? What would happen? Would this inbreeding cause the population to go extinct? Could ...
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1answer
74 views

Can soap kill cockroaches and/or ants? If so, how? [duplicate]

Is it possible to use dishwashing soap as an alternative insecticide? How would that and what are the components of the dishwashing soap that would kill the insect?
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29 views

Do elephants get thorns out of each other's skin?

I have watched Wild Kratts Elephant in the Room several times where a baby elephant named Thornsley has a big thorn in his foot and is nowhere near his mom. This along with herd members helping each ...
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2answers
109 views

Are human beings evolved to eat meat? [duplicate]

I know humans can cook, and prepare almost anything, but are humans specifically adapted to eat meat. One of my doubts humans are not particularly well adapted to eat meat because they lack canine ...
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1answer
99 views

Are the cells (structures) of deep sea fish different? And can they survive in shallow water?

In the deep oceans the pressure is enormous. But still there are fish living. But are the cells of them different from fish who just live at the surface of waters? For example, are the cells smaller ...
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3answers
10k views

Why is it that cats can jump so high for their size, compared with humans?

My cat is about 1' high at the shoulder, and I am a little over 6', but my cat can easily jump onto something as high as I am. That is 6x it's height. If a cat can do this, then Why can't I jump up ...