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Three rhinos at the Toronto Zoo in 2006

looks like a great and spacious exhibit!

since when are there there three,all i've ever seen is Yeki and a secong unknown?

I saw three there in 97

In 1997, the zoo had three white rhinos: Bull (m), Pistol (f), and Shaboola (f), the offspring of the first two.

When this photo was taken in 2006, there were four white rhinos at the zoo: Bull (m), Yeki (m), Shaboola (f), and Leni (f). Bull, Shaboola, and Leni were together to (hopefully, and unsuccessfully) stimulate breeding. Due to behavioural issues, Yeki was a solitary rhino.

How many rhinos are at the zoo now 2 or 1? Shaboola and Leni right?

Actually, just one (Shaboola)
Leni was returned to African Lion Safari earlier this year.

Does the zoo plan on getting any more rhinos? and I noticed that the rhinos have there horns cut off why is that?

I believe the zoo is trying to acquire some more white rhinos, but this takes time.
Only one rhino at the zoo had "flat" horns - Yeki ... however, the horns were not cut off. He spend a lot of time rubbing the horns on objects (and ramming them ...), which wore them down to almost the level of his face.