Zuko had already arrived at the zoom and was currently standing in the rhino pen near Appa, patting one of bison's gigantic paws and telling it to relax when it gave a rumble upon spotting Yue. The prince looked up at the princess - he recognized her after only catching a brief glimpse of her at the North Pole, but did not know her. He'd barely even said anything to her over the message boards since she'd arrived here. Iroh had told him that Princess Yue had died in order to take the place of the fish Zhao had killed, but she looked...very much un-dead.
He decided it wasn't the time to ask about that and stored the question away for later, instead raising a hand and giving a light wave in her direction to show that it was save to decend. Lucky for them, the zoo keepers had shut all the rhinos in cages at the back of the pen for the night.