The biological study of animals.

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In an open circulatory system, how is blood moved?

In the mollusks section, the powerpoint mentioned that gastropods and bivalves have an open circulatory system. According to the note, this means that the blood does not travel in vessels. How, then, ...
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84 views

Are these bat social calls?

I'm currently researching bat social calls (not echolocation calls) and have been given a series of samples (in .wav format) and wanted to know, if what I can hear is actually the social calls. Below ...
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2k views

Cats, Dogs and Bears - how are they related?

What is the ancestral relationship between cats, dogs and bears? I presume they are more closely related to one another than other paraphyletic clades of mammal. Which came first? What did their ...
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259 views

What insect is this?

I found it in Russia. Where they usually live? What they eat? Full length is approximately 2 cm.
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268 views

How long can you keep sheep eyes in formaldehyde before dissecting?

We're preparing for an experiment in our classroom and my teaching partner and I are at different points in the unit. I am concerned that the experiment will be less successful because of the ...
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28 views

Do snail shells increase the number of rounds with age?

Do snail shells increase the number of rounds with snail age?
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130 views

List of the biggest companies that work in selective breeding

Looking at this question, I've been wondering, What are the biggest private companies which work in both animal and non-animal selective breeding? Let me know if Biology.SE is not appropriate for ...
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87 views

Do chicks in eggs excrete?

I want to know if, as a baby chick grows inside the egg, does it excrete waste? If it does excrete waste, does the waste just sit inside the egg with the chick, until the chick cracks open the egg ...
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58 views

Clownfishes and Sea anemones

Relation between clownfishes and sea anemones is a classic example of mutualism. I wanted to list the species of sea anemones that are involved in this mutualism but I got lost.. Could you help me ...
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117 views

Why would the Camargue horses have a white coat while the foal have a dark coat?

The current issue of the magazine Lonely Planet India(Oct 2013) presents a photo of Camargue Horses which are white coated and mentions that they are born with dark hair. A search shows that the foal ...
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208 views

Raphide toxicity in Pothos plant

Recently I found out that the common houseplant Pothos (Epipremnum aureum) is toxic to cats and dogs due to the presence of "insoluble raphides." I have a lot of these plants around my house and my ...
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320 views

How do animals/plants change for each season?

The question pretty much sums it up. How do animals/plants change for each: Spring, Summer, Autumn, and Winter? A detailed explanation on distinct behaviour and appearance changes would be nice.
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24 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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43 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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41 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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35 views

Where do flies go?

Where are flies attracted most? Apart from food odours, of course. Why do they seem to be attracted by hot and humid places? Do they prefer shades or light? Why do they tend to get inside very easily? ...
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275 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.
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64 views

Can pets catch the cold?

Last night I was drying my cat with a towel after shenanigans in the rain and she sneezed! Questions Can cats/dogs/hamsters or other pets catch the cold? How quickly do they recover?
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158 views

Can anyone identify this caterpillar / cocoon?

This insect is about 0.5 mm in length, so it is very small. It doesn't have legs I don't believe, I am not too good at this but I don't know if it's a worm or more like a cocoon for something. I do ...
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65 views

Is there an animal which, when eaten by other animal, poisons the predator and gets out of it's stomach?

It was a question in one competition, but it remained unanswered and i am curious about an answer. There was a hint: American bullfrog but i can not find any example of this behaviour on the web.
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List of non-native terrestrial molluscs in California?

I'm looking for a list of non-native terrestrial molluscs in California. Ideally, I also need the date each taxon was introduced into California. Can anyone help?
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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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83 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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32 views

Parazoa as part of sewage plant

in our zoology lecture our prof was talking about parazoa, the sponges, and that they are getting more and more in the focus of the biotech research. As he described there way of getting food, as ...
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37 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 ...
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121 views

Regarding the kingdom Animalia, which phylogenic tree is more common: Molecular Comparisons or Body-Plan Grades

In the picture below, which I obviously do not own: it depicts two different phylogenic trees, one which is based on molecular comparisons and another one which is based on body-plan grades. My ...
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27 views

Temporal effects on pathways? [closed]

I was wondering whether or not there exist certain pathways that are triggered by a temporal signal. We're almost at the winter solstice now. Does animal or plant function involve signals that are ...
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84 views

Niche overlap Index

I wanted to use the compana() function from the adehabitat package. I don't really understand the meaning of the data in the ...
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41 views

Does sleep duration vary for animals based on time of the year?

I'm interested in the sleep patterns of wild animals, that still use sun for controlling their biological clock. Animals entrain their biological clock to the day/night cycle using light as the ...
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40 views

why water is a proof of a life? [duplicate]

I read that NASA looks for water on Mars or other planets as a sign of a life. I wonder why scientists look for water as proof of a life? isn't there any animal that drinks another liquid like ...
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23 views

Do the antlers re-grow in the same pattern every year? [duplicate]

I am a software engineer and I am trying to develop a system to identify a deer by its photograph. Most deers lose their antlers every year. I would like to know if they re-grow in the same pattern ...
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101 views

When is wing growth in the bat complete and how soon can bats fly after wing growth is complete?

I was reading this paper by Cretekos et al (2008), in which they state that wing development in the bat is not complete until after birth - the wing continues to elongate postnatally. This would ...
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709 views

How do ants know where they are going without eyes? [closed]

I know that ants have some sense of direction, but what is the physiology behind this sense?
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95 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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85 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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160 views

What beetle is this?

I've found it in my kitchen. It seems to be that he flew through the window from the street. The country is Russia.
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94 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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52 views

Is there any possible way that hybrids can mate?

I'm writing a book, and a a portion of it involves a society of humanzees. Now, is there any plausible way that a hybrid (such as a humanzee) could procreate either with one another, or with their ...
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781 views

Identifying internal structure of dissected prawn

Note: Some of the images might be disturbing. I have dissected prawn for the first time. Would like your help in identifying some structures . This is the dissection of the posterior part of the ...
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195 views

What are the universal laws of Nature concerning animals' behaviour? [closed]

I'm looking for very old (centuries) treaty or recent (20 & 21th century) research that state what some of the laws of Nature are, particularly concerning wild animals' behaviour. Such as; every ...
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64 views

Does anyone know what marsupial this is? [closed]

I know what this is a marsupial, but i'm not quite sure which one. Any thoughts?
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40 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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59 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 ...
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38 views

How do cats shed their fur?

Dogs shed their fur twice a year, so I assume this is the same with cats. What is the mechanism whereby the change in temperature (assuming this is what causes the shedding) leads to the falling off ...
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188 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?
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73 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 ...
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34 views

Information and image of Genus Acesina

I am searching for image and information, like distribution etc of the genus Acesina. The Taxonomic tree is: ...
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385 views

Do cockroaches have less health issues than humans?

Cockroaches are known to live in very dirty places like sewers. Does this cause them to evolve to be stronger against parasites and bacteria? Recently I read online that cockroaches can sustain ...
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38 views

Can Kit fox and Red fox 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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25 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?