When my nephew was in grade school he went out with other kids to look for spider species which are used in spider games. They will put 2 opposing spiders on a horizontal stick, spiders will chase and fight until the stronger spider eats the weaker one. Eating involves sucking the prey until all the juices are extracted and the exoskeleton shrunk, until you will not anymore recognize that it was once a spider. The winner who sucked the looser will now bloat to a bigger size. They say it can expand double its size depending on the size of the prey. References say spiders can sometimes stay without food for a long time, but maybe that depends on the species. They are carnivorous and eat insects caught in their webs and also other spiders smaller than themselves.
The yellow ones are the most common and biggest spider i see around
(Giant wood spider belonging to Nephila species). Look at the web, there are small
red spiders caught there, maybe they will be eaten later or maybe too small for the owner.
they normally build their webs high up on shrubs and trees, and the web
is made of very sticky golden threads coming out of their bodies
last summer we saw two colors, yellow and red, but they seem to have the same morphology. We put them on a horizontal stick and observed their actions, but nothing. They don't fight just dislike each other.
We brought them down to see if they will fight but constant prodding did not provoke them. At least one of them will always run away without fighting.
This is another spider which i saw on my Duranta erecta bush.
It is so small but on close -up is very beautiful (close-up below)
This one is a greenish spider which doesn't look as scary as the Giant wood spider. Its web
thread is also fine and not very sticky. The web is also very meticulously done, unlike
the previous spiders above.