No birds do not urinate. They lack a urinary bladder like mammals with ostrich as an exception. Urine as we know it, contains urea and is in a liquid form. Whereas, birds excrete uric acid which is not soluble in water and is excreted as a white paste from their cloaca when mixed with other liquids.
"Birds do not urinate... Birds excrete uric acid which is not soluble in
water and is excreted as a white paste from their cloaca when mixed
with other liquids." Quoted from
fh_shafqat's answer