(i) Micro animal: Those animals which are very small and microscopic are called Micro animals. For example, malaria bacteria (Plasmodium vivax), dysentery bacteria (Entamoeba histolytica) etc.
(ii) Macro animal: Those animals which are large in size and can be seen with the naked eye are called macro animals. For example, guinea pig (Cavia porcellus), Indian elephant (Elephas indicus), blue whale (Balaenoptera musculus) etc.