Znalazłem ostatnio taką oto ciekawostkę na stronie National Geographic:

"Desert Spider

The web-building desert spider (Stegodyphus lineatus) has even less control over the type of prey it eats, Mayntz says.
"It cannot do anything to attract specific animals with specific nutrients," Mayntz said. "It has to deal with whatever ends up in the web."
Yet the study team discovered that the desert spider is able to extract nutrients selectively from a single fruit fly, depending on the spider's previous meals. It's unclear how desert spiders manage this, though the researchers suspect it's to do with enzymes the spider pumps into its prey to digest its insides.
"The spiders let the enzymes work for a while, then suck up the half-digested juice," Mayntz said.
"Apparently they are able to take more protein out via the enzymes if the last prey they ate was poor in protein." Possible mechanisms that allow insects and other invertebrates to alter their feeding according to nutritional need have been identified by two of Mayntz's colleagues at Oxford University's zoology department, Stephen J. Simpson and David Raubenheimer."


Dla nie znających tego języka wyjaśniam, że najnowsze badania naukowe
dowodzą, że pająki potrafią dobrać z udostępnionego im przez naturę posiłku,
potrzebne im w danej chwili składniki pokarmowe. Można więc śmiało wysunąć
tezę, że różnicowanie diety nie ma praktycznie znaczenia w żywieniu pająków.</p>


Całość artykułu (To co o pająkach wkleiłem powyżej.) pod adresem:
http://news.nationalgeographic.com/n...ider_diet.html