Imagine being in a skyscraper. Close the windows, and would you still be able to tell if you were on the first floor or the hundredth? Forest canopies are different – the top and bottom are entirely different world. Let’s go on a tour of Puerto Rican moist tropical forest, and climb twenty or thirty…

William Blake once wrote a poem, “The Little Girl Lost”, about two parents searching for their child through valley and desert. This week I have returned to Puerto Rico, on a much less pressing errand – the resurvey of a forest for the second year of a five-year study on forest dynamics. Last year, our…