Identification key

First mark out the survey area and identify the species to be counted, using an identification key if needed. Place two measuring tapes at right angles along the edges of the area. Choose pairs of random coordinates to position the quadrat, rather than putting it where the species looks plentiful.

An identification key can be used to compare observable features with a sequence of choices. This narrows the possible identities systematically, but laboratory testing may still be needed to confirm the result.