|a3= The condition arises most often in breeding birds during or following incubation of their eggs. Some birds sit very tight, failing to get off the eggs and void their cloacal contents at irregular intervals. Precipitation of urates in the cloaca can, in time, lead to the formation of a uric acid concretion: a urolith. | |a3= The condition arises most often in breeding birds during or following incubation of their eggs. Some birds sit very tight, failing to get off the eggs and void their cloacal contents at irregular intervals. Precipitation of urates in the cloaca can, in time, lead to the formation of a uric acid concretion: a urolith. |