part of part of in taxon results in development of animal organ development anatomical structure development urinary bladder development GO:0060157 biological_process The process whose specific outcome is the progression of the urinary bladder over time, from its formation to the mature structure. The urinary bladder is an elastic, muscular sac situated in the anterior part of the pelvic cavity in which urine collects before excretion. renal system development Vertebrata <vertebrates> Aves urinary bladder