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Mammals are warm-blooded, they create their own heat and therefore are capable of constant activity regardless of the temperature of their surroundings (within reason of course)

Reptiles are cold-blooded, they have to lie in the sun and warm up before they become active.

How do fish work? They don't create their own heat, and they don't need to warm themselves. Why is this so?

I was wondering about dogs actually.

They show some emotions via their tail.

Happy = tail wags.

Unhappy = tail between legs.

Been caught being naughty - maybe weed on the carpet, or been found laying on the bed - tail is down low, & does a sort of mini-wag. What's the emotion there? "I've been naughty, please forgive me, I like you"?

Fish. A specillaist subject of mine. Although most fish are exclusively aquatic and cold-blooded, there are exceptions to both cases. Fish from a number of different groups have evolved the capacity to live out of the water for extended periods of time. Of these amphibious fish some such as the mudskipper can live and move about on land for up to several days. Also, certain species of fish maintain elevated body temperatures to varying degrees. Endothermic teleosts (bony fishes) are all in the suborder Scombroidei and include the billfishes, tunas, and one species of "primitive" mackerel (Gasterochisma melampus). All sharks in the family Lamnidae – shortfin mako, long fin mako, white, porbeagle, and salmon shark – are known to have the capacity for endothermy, and evidence suggests the trait exists in family Alopiidae (thresher sharks). The degree of endothermy varies from the billfish, which warm only their eyes and brain, to bluefin tuna and porbeagle sharks who maintain body temperatures elevated in excess of 20 °C above ambient water temperatures. See also gigantothermy. Endothermy, though metabolically costly, is thought to provide advantages such as increased contractile force of muscles, higher rates of central nervous system processing, and higher rates of digestion.
 As with many aquatic animals, most fishes release their nitrogenous wastes as ammonia. Some of the wastes diffuse through the gills into the surrounding water. Others are removed by the kidneys, excretory organs that filter wastes from the blood. Kidneys help fishes control the amount of ammonia in their bodies. Saltwater fish tend to lose water because of osmosis. In saltwater fish, the kidneys concentrate wastes and return as much water as possible back to the body. The reverse happens in freshwater fish, they tend to gain water continuously. The kidneys of freshwater fish are specially adapted to pump out large amounts of dilute urine. Some fish have specially adapted kidneys that change their function, allowing them to move from freshwater to saltwater.
Fish have well-developed nervous systems that organize around a central brain, that is divided into different parts. The most anterior, or front, end of the brain are the olfactory bulbs, which are involved in the fish's sense of smell. Unlike most vertebrates, the cerebrum of the fish primarily processes the sense of smell rather than being responsible for all voluntary actions. The optic lobes process information from the eyes. The cerebellum coordinates body movements while the medulla oblongata controls the functions of internal organs. Most fishes possess highly developed sense organs. Nearly all daylight fish have well-developed eyes that have color vision that is at least as good as a human's. Many fish also have specialized cells known as chemoreceptors that are responsible for extraordinary senses of taste and smell. Although they have ears in their heads, many fish may not hear sounds very well. However, most fishes have sensitive receptors that form the lateral line system. The lateral line system allows for many fish to detect gentle currents and vibrations, as well as to sense the motion of other nearby fish and prey. In 2003, it was found by Scottish scientists at Edinburgh University performing research on rainbow trout that fish exhibit behaviors often associated with pain, Although zoologist James D. Rose disputes that fish actually feel pain.Some fishes, such as catfish and sharks, have organs that detect low levels electric current. Other fishes, like the electric eel, can produce their own electricity.



Was just waiting for the chance to tell someone that: the answer is Endothermy



(copyright,Wikipedia  ;scarymoment;)

A dog that wee's on the carpet or sleeps in your bed doesn't usually know that the deed is wrong, it just knows that you are annoyed with it by your body language and the tone of your voice. what he is really doing with the mini wag is testing the water to see how much trouble he's in.

The sad thing is, people tend to see this behaviour as an admission of guilt "Look at him, he knows what he' done" and punish the dog for being deliberately naughty.

Once he really understands that he must not do these things, it's very rare a dog will disobey the rules. Before you punish a dog you must be absolutely, 100% sure that he disobeyed you on purpose, and even then, you have to catch him in the act to be sure he associates the punishment with the "crime"

(http://upload.wikimedia.org/wikipedia/commons/thumb/4/49/Sashimixx.JPG/200px-Sashimixx.JPG)

Fish should be stored at as close to zero degrees Celsius as possible.  In Japan, their fridge-freezers often have 3 compartments (whereas we only usually have two), one is the fridge, one is the deep-freeze, and the third is for fish.

 

Thanks Tom, that makes sense now.

Now, shall I go to Luton tonight........Hmmmmm?

Fascinating stuff, thanks Tighty.

Now, what's on at Luton tonight?

£50 plus one rebuy or one add on

4000 chips and a 30 minute clock


The defending champion from last week (cough, cough) will be passing his crown to someone else, in all probability

See you there

£50 Single rebuy, 4k chips.

I gotta make a decision in next 5 mins, & I'm all of a dither.

If you have a bad cold, might be best you don't go.

:dontask:

How much does it make Rich?

£4000 plus