nurse log: a large decomposing tree trunk that has fallen, usually in a forest; the decaying wood provides moisture and nutrients for a variety of insects and plants
substance: the real physical matter of which a person or thing consists
platyrrhini: New World monkeys: capuchin; douroucouli; howler monkey; saki; spider monkey; squirrel monkey; titi; uakari; woolly monkey; marmoset; tamarin