What creates these small, sand, chimneys on the flow-facing surface of boulders? These were found in Rio Bella Vista, a fast-moving, cold, cascading stream in Las Alturas.
Río Bella Vista remains stunning and quite unchanged since my first visit in 2013.
Darko, a coordinator for the REU, and Cristian are seen in the background of a few images.
Including a couple of short videos of the river’s flow.
Tropical, pre-montane wet forest with tree ferns, strangler figs, cerdro (Cedrella spp.), and some avocado relatives.
Parasitoid larvae, probably from a wasp, have emerged from the black wounds of this caterpillar, perhaps a hesperidae butterfly, and pupated.
Check out the trachea (the branching gas exchange organs observed through the skin of the caterpillar) and the punctures from the larval exits!
Found along Sendero Echandi.