The process whose specific outcome is the progression of the head kidney over time, from its formation to the mature structure. The head kidney is a pronephros that consists of fused bilateral lobes located in the anterior part of the kidney. It is analogous to the mammalian bone marrow and the primary site of definitive hematopoiesis. [ GOC:mtg_kidney_jan10 ZFA:0000669 ]

This is just here as a test because I lose it