Reichs does not find this extraordinary.
“A rainforest habitat means many micro-environments,” she explains. “Decomposition can occur quite rapidly in some [micro-environments],” but due to factors like variance in river current, flora growing on the banks, and transport by scavengers, “preservation or decomposition of various body parts can occur at a different rates.”
Exposed regions on sandbars or along the banks also receive more sunlight, which could account for the observed bone bleaching after the soft tissue is sloughed off.
The extreme fragmentation of the remains doesn’t surprise Reichs either.
“With bodies decomposing in water, dismemberment follows typical patterns with the head and limbs detaching first,” says Reichs, whose next novel, The Bone Collection, will be out November 1, 2016.
“Further damage from animal scavenging can be very diverse due to multiple transport modes: avian, fish, turtle, crab, small and large carnivores, etcetera,” she says.