part of development of animal secondary sexual characteristics development of animal secondary male sexual characteristics https://github.com/geneontology/go-ontology/issues/31051 development of secondary male sexual characteristics, sensu Metazoa development of secondary male sexual characteristics The process whose specific outcome is the progression of the secondary male sexual characteristics over time, from their formation to the mature structures. In male mammals, examples include growth of axillary, chest, and pubic hair, voice changes, and testicular/penile enlargement. Development occurs in response to sex hormone secretion. GO:0046544 biological_process male sex differentiation