Swaystack

Swaystacks are large 30ft stalky animals native to GPC9-25 in the Alien Faces Universe. Despite looking like plants, they are actually animals with root-like tentacles that skitter in movement and root into the ground to stay in place, as they sway in the wind to blend in with the scenery, until something like the Lollygars come by, to which it releases their offspring onto the Lollygar, and carry it off to drop into another area where they grow into another Swaystack.