Random question I know but I am very confused after visiting the zoo yesterday. I was at the St. Louis Zoo yesterday and stopped by the Black Rhino area as I made my way around the zoo. After a few minutes of watch the Black Rhino (I do not know if it was a male or female) it backed up to one of the stone walls where there was a stain on the wall. I thought maybe it was from rain water or urine or something. As I am thinking this a stream of white liquid with the consistency of water shoots out from the rhino's rear end. Now, I about died from laughing so hard when I saw this but I really want to know what I witnessed. It did not look like any kind of urine I have ever seen a animal produce and I am fairly sure semen is semen. I just assume semen is semen in any male mammals. It began to rain shortly after leaving the enclosure and I did not get a chance to find a worker to ask. I tried looking it up online last night and ignorant/exhausted me didn't put 2 and 2 together when i googled "Black Rhino squirting white liquid". Bad bad bad search results.