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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Wed Oct 30, 2013 4:45 am 
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O do belive so, not all hair is on all mammals visible as we would like to know. Thinking of a few examples: the whale has hair like sensors on his tongue (made of keratin), dolphins have hair on their noses, those 'hairless' cats have whiskers...
So every mammal has some form of hair (keratin based filament) that we can classify as hair on their body.

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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Wed Oct 30, 2013 8:43 am 
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I believe they do at some stage of their life. At birth or maybe tiny "hairs" to use as senses?

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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Wed Oct 30, 2013 12:50 pm 
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All mammals have hair at some point during their development, and most have hair their entire lives. Adults of some species lose most or all of their hair but, even in mammals like whales and dolphins, hair is present at least during some phase of ontogeny. Mammalian hair, made of a protein called keratin, serves at least four functions. First, it slows the exchange of heat with the environment (insulation). Second, specialized hairs (whiskers or "vibrissae") have a sensory function, letting an animal know when it is in contact with an object in its environment. Vibrissae are often richly innervated and well supplied with muscles that control their position. Third, hair affects appearance through its color and pattern, helping to camouflage predators or prey as well as signal to predators a defensive mechanism (for example, the conspicuous color pattern of a skunk is a warning to predators). Hair also communicates social information (for example, threats, such as the erect hair on the back of a wolf; sex, such as the different colors of male and female capuchin monkeys; or the presence of danger, such as the white underside of the tail of a white-tailed deer). Fourth, hair provides some protection, simply by providing an additional protective layer (against abrasion or sunburn, for example) or by taking on the form of dangerous spines that deter predators (porcupines, spiny rats, others).

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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Thu Oct 31, 2013 2:10 am 
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Heksie, Philip, Phokojwe ... all correct. :clap:

Over to you. Heksie. :thumbs_up:

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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Thu Oct 31, 2013 6:32 am 
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Thanks OWN

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The many functions of hair include the retention of heat, sexual dimorphism...


So I would like to know what is sexual dimorphism and give an example please.

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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Thu Oct 31, 2013 9:00 am 
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Sexual dimorphism is a term describing the gender-based physical differences that often exist in various animal species.

"In many cases, sexual dimorphism exists primarily to serve as an aid to identification or to foster sexual attraction. For example, in the peacock, the bright tail plumage helps the male secure a mate. In other animals, this kind of attraction might be generated from a change in basic form, or even an additional body part that stands out visually".

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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Thu Oct 31, 2013 10:59 am 
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Yes Philip :thumbs_up:
The lion is a great example of dimorphism with hair :w:

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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Mon Nov 04, 2013 12:56 pm 
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:wink: How is gas exchange done in mammals?

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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Tue Nov 05, 2013 7:00 am 
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Through the repsiratory system?
They use their lungs when inhaling oxygen and then the carbon dioxide gets released...
If this was the gas you are talking about :hmz:

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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Tue Nov 05, 2013 10:09 am 
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Heksie wrote:
Through the repsiratory system? They use their lungs........ :hmz:


:hmz: A bit more Heksie. (One thing i'm looking for.) :)

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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Tue Nov 05, 2013 11:21 am 
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The actual gas exchange occurs in the alveolus/alveloi (air sacs).

Capillaries carrying deoxygenated blood from the pulmonary artery run across the alveoli.
Inhaled oxygen is able to diffuse into the capillaries from the alveoli, while carbon dioxide from the blood diffuses in the opposite direction into the alveoli. The carbon dioxide can then be exhaled out of the body.

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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Tue Nov 05, 2013 12:04 pm 
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Heksie wrote:
Philip you must read between the lines :w:


Mammals breathe through lungs, their respiration is pulmonary. 8)

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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Mon Nov 11, 2013 10:15 am 
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Almost all mammals are endothermic but there is one species that can be considered ectothermic.
Which species is this?

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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Mon Nov 11, 2013 10:21 am 
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That mole rat with no hair... :hmz:
Because it has a very low metabolic and respiratory rate? So it stays underground and gets it heat from the earth?

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 Post subject: Re: Revolving Mammal Quiz (RV)
Unread postPosted: Tue Nov 12, 2013 10:38 am 
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Heksie :thumbs_up:

Naked mole rats live under-ground, so their environmental temperature is well buffered against extremes of heat and cold. They live in arid environments where food is limited, so maintaining a high internal temperature would be wasteful of the available energy supplies (roots and tubers). Since they do not need to retain internally produced body heat they don't need fur as insulation.

Some other mammals have very low metabolic rates as adaptations to their habitat (usually due to having an energy poor diet in a warm environment) - sloths and howler monkeys are a good example, but the naked mole rat is the most extreme example of a mammal that has lost the ability to closely control its internal temperature.

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