Protozoan parasites of the blood of British wild birds and mammals*

The reported occurrence of protozoan parasites of the blood of British wild birds and mammals is reviewed. Nineteen species of British birds have been recorded as hosts of Haemoproteus (or Parahaemoproteus), Leucocytozoon (or Akiba), Plasmodium, Trypanosoma or “atoxoplasms” (a group whose taxonomic status is presently in doubt), and seventeen species of British mammals are known to be hosts of Babesia, Hepatozoon, Polychromophilus or Trypanosoma (including at least three species from Chiroptera: T. (Schizotrypanum) dionisii, T. (S.) vespertilionis and T. (Megatrypanum) incertum).