another creature done and not submitted in time for a cghub contest D: - the prompt was to make two creatures dependent on each other locked in a symbiotic life, from "birth".
my concept was that the two creatures - the giant prow-headed walker and the lumpy tentacley sac - are born together but that the sac is initially an internal digestive organ. it's the product of an internalized parasite that has reached symbiosis over the millenia.
after a quick and violent juvenile period as ground-layer scavengers, the young prow-head reaches physical maturity and rockets into a gargantuan size. during this time, however, it stops feeding altogether.
the stream of hormones essentially aggrandizes the sac-creature and it grow splits the skin and becomes the primary feeding organ for the prow-head. this enables the prow-head to sustain its huge bulk safely from the height of the canopy, and the sac-creature to have a safe vessel to transport itself with.
i didnt quite work it all out - reproduction was a mess i didnt want to tangle with, lol.
but i ran out of time. alas.