sentences:  By fogging the forest canopy with pesticide, he collected the falling specimens and found 1,200 species of beetles living in "" trees.Of those 1,200 species of beetles, he estimated that 163 are found only in the "Luehea seemannii" tree and not in other species of trees.There are about 50,000 species of trees in the tropics and beetles make up 40% of insects and related animals.