Creature - Elemental 4/4, 3GG (5) Tap an untapped creature you control: Llanowar Behemoth gets +1/+1 until end of turn.1 "Most people can't build decent weapons out of stone or steel. Trust the elves to do it with only mud and vines." -Gerrard of the Weatherlight
Illus. Hannibal King
You can use its ability to tap creatures that have summoning sickness. Summoning sickness only prevents the payment of abilities with a tap symbol in the cost, not the tapping by other cards as a cost. [Duelist Magazine #19, Page 34]
Can tap itself even if it has summoning sickness. [Aahz 1997/06/25] This is because summoning sickness only prevents abilities with the {Tap} symbol in the cost. Summoning sickness does not affect other ways of tapping a creature.
Note - This card was of creature type "Behemoth" and not "Elemental" until Ninth Edition and Oracle 2005/08/01.