This talk mentions some aspects of the theory of identical particles, for example, treating neutrons and protons as identical particles distinguished by a quantum number called isotopic spin. He will also review studies of systems of three or more anyons. In particular, the virial expansion shows that the free anyon gas approximates exclusion statistics, with a correspondence between the anyon parameter and the exclusion parameter which is different from the case of anyons in a magnetic field, discussed in the talk by Jon Magne Leinaas.