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View Full Version : Why are there pygmy or mini versions of animals?


HorseloverFat
04-02-2009, 03:10 PM
Is there a biological reason why so many animals have a pygmy or mini version of themselves? Is there a niche they fill that normal sized animals cant? Is there a pygmy gene carrier all animals have an ancestor with?

BlinkingDuck
04-02-2009, 03:16 PM
WAG

There are probably isolated and have limited resources so evolution favors a smaller, less resource needy animal...

Lemur866
04-02-2009, 03:53 PM
Think about humans. There are a many simple mutations that will cause human beings to be very short in adulthood (see http://en.wikipedia.org/wiki/Dwarfism). If an environment exists where smaller organisms have more offspring, those genes become fixed and after several generations every member of the population will have them.

On islands large species tend to get smaller while small species tend to get larger:

http://en.wikipedia.org/wiki/Insular_dwarfism
http://en.wikipedia.org/wiki/Island_gigantism

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