increased urine

Hello, I have a white bellied caique, 16 years old. He's been active and vocal but lately very watery poops and little feces. Seems like he strains as well when he poops. Vent as well as area around is clean. Morning poops seem well formed and urates + urine looks consistent. Feces color is...

For some info: This is not my bird, But a friends bird and I think it might have polyuria but I have no way of telling and my friend thinks his bird has polyuria but as far as I know the urine amount looks normal to me, But I may be wrong and I'm pretty concerned about his budgie and his...