SRD:Giant Ant Queen

=GIANT ANT QUEEN=

Giant ants are among the hardiest and most adaptable vermin. Soldiers and workers are about 6 feet long, while queens can grow to a length of 9 feet.

Combat
Improved Grab (Ex): To use this ability, a giant ant must hit with its bite attack.

Skills: *Giant ants have a +4 racial bonus on Survival checks when tracking by scent and a +8 racial bonus on Climb checks. A giant ant can always choose to take 10 on Climb checks, even if rushed or threatened.

See Wikipedia Entry: Ant