Aechor Petals are a drop from Aechor Plants, and they drop them when killed.
They are used to tame Moas. When Moa Eggs hatch upon being incubated in an Incubator, they will periodically display a status message above their heads that reads "Hungry", which indicates that they must be fed with an Aechor Petal.
Aechor Petal's data values are:
4492 (dec), 118C (hex), 1000110001100 (bin)
Issues relating to Aechor Petal are maintained on the bug tracker. Report issues for Aechor Petal there.