Very true. There are 300 or so species of hover fly alone. You can only tell some of them apart by examining the genitalia under a microscope; it's the same with many spiders. Every subject I have picked up has exploded in complexity when I really gets into it (invertebrates, grasses, mosses, lichens, fungi ... the list goes on). Grasshoppers are OK, there are only 6 species in Powys 
One of the county recorders I spend time with in the field specialises in wasps and bees - she points out wasps that are only a few millimetres long and identifies many species of bees that all look the same to me.
As a relatively experienced amateur, my ID skills fade into insignificance compared to the people I spend time with. Not helped by my memory losing more species each year than I'm learning
The insects book I recommended above only covers 1,653 species out of about 25,000 in Britain (over a million known worldwide)!
One of the county recorders I spend time with in the field specialises in wasps and bees - she points out wasps that are only a few millimetres long and identifies many species of bees that all look the same to me.
As a relatively experienced amateur, my ID skills fade into insignificance compared to the people I spend time with. Not helped by my memory losing more species each year than I'm learning
The insects book I recommended above only covers 1,653 species out of about 25,000 in Britain (over a million known worldwide)!


