Here's another Change.org petition that I'm not signing, though you might.
One of the zoo’s giraffes suddenly died and was found to have 40 pounds of plastic trash in its stomach.
The zoo is overcrowded and doesn't have a veterinarian on hand, so when animals fall ill they are left to suffer like Yani.
What I'm not seeing here is why it would be better to shut the zoo down, altogether, rather than improve it. Generally mending is better than ending...especially when animals who've become accustomed to being fed by humans are involved.