The effect of poly-l-lysine and urine volume upon the attachment to microscope slides of sperm from the urine of Numbats (Myrmecobius fasciatus) and Dibblers (Parantechinus apicalis).

Sperm in numbat and dibbler urine can be seen reliably in wet preparations but adhesion of sperm to the microscope slide during fixation and staining has not been relable. Slide coated with poly-L-lysine show 20% more sperm remaining compared to uncoated slides.