These symmetrical marks around fold lines of a Cryosophila palm leaf were made before the leaf unfolded, probably the work of leaf beetles, Prosopodonta sp. (Chrysomelidae; Cassidinae, Prosopodontinae). Thanks to Don Windsor at the Smithsonian Tropical Research Institute for that tentative identification.
Large mushrooom emerging from a leaf cutter ant nest. My understanding is that when a leaf cutter colony dies, their fungal symbiont (ordinarily propagated clonaly by the ant) can fruit, producing these giant mushrooms. I have not been able to confirm this.