For those readers who have never experienced unconditional love, get a dog.
As far as "zoo" animals, I am not a fan of zoo's because I believe the confined area where these beautiful animals are forced to live is a form of animal abuse. And today with the internet, all of these wonderful creatures can be viewed on the internet so Zoo's in my opinion are like circuses, a relic of the past.
If you want to see something very sad, visit Sea World and do a little investigative work to see how horrible those whales and dolphins are treated. Whales are confined into an area the size of my backyard swimming pool. And for what? So humans can be entertained watching a person ride on the back of a whale? And then everyone wonders why these whales get pissed off, right?