How many species of insect are there in rain forest canopy?
After sampling Panamanian trees in 1982 Terry Erwin, wrote a seminal paper in which he estimated there to be 30 million anthropods worldwide, far in excess of the previous estimate for the total number of species on Earth. Some experts disgree with Erwin’s calculations, but most now agree previous estimates were far too low. We do know that samples from a single tree species can contain over 100,000 species of beetle (say), and there may be about 50,000 species of rain forest tree. See http://www.sei.org/terry.html and http://invertebrates.ifas.ufl.edu/ErwinRevised.pdf What exactly is a dirigible and what is an airship? A dirigible is steerable balloon, or a non-rigid airship. An airship is a general name for an aircraft that uses lighter-than-air gases (usually hydrogen, helium or heated air) to provide part or all of the lift force to balance its weight. Airships are usually divided into: rigid airships, semi-rigid airships and non-rigids. Rigid airships have a structural outer frame
