Waste products your body doesn't need.
to separate from the blood and cast out; to perform excretion.
Same as us, through their excretory orifices.
I think that some types of jellyfish dont excrete.
The Quick Answer: Yes birds do. However ... They don't urinate through a separate orifice. In birds and reptiles there is generally one opening which serves or feces, urine, reproduction and egg...