Forgive me if some of these were said. I just got to this thread and was eager to make a post, but I haven't gone through each page. So here it goes.
Being a volunteer at my city zoo, I'd have to say people... especially teens and adults, mixing up animals. For example
Adults rushing up to the tiger exhibit exclaiming "look, the lions!" When I'd say these are the Sumatran tigers, as if the sign, Asian-themed area, and multiple tiger educational items scattered about didn't make that obvious.
People, mainly adults, thinking the very fake zebra carcass in the vultures exhibit is real. Their faces of shock or disgust or "is that real??!" by people looking directly at this obvious fake animal kinda makes me wonder and worry. From a distance, I'd understand, but when you're right at the exhibit looking straight at it and see the hard-textured "fur" and paint, and still wonder if it's real, that's when I begin to worry. Other issues.
Adults banging on the glass at big cat exhibits.
A lady calling the komodo dragon an alligator. A teen, another day, said the dragon was Mrs. Kipling from Jessie. I understood that a hell of a lot more than it being mistaken for a gator, but the reptile lover in me still somewhat cringed.
Being completely ignored by children when you're trying to tell them facts. I understand kids don't have the longest attention spans, but I can't help but feel kinda dumb when I'm telling them a goat's name or a fun fact about lions when they seemed interested, then completely turn away.
People bragging about chopping snakes up or killing them on sight when I had reptile house shifts. Snakes are my favorite reptiles and hearing people brag about killing misunderstood animals like they're badasses when I'm telling you facts on why snakes are important makes me a bit upset. One lady came up to the copperhead exhibit and began sharing a pic of a copperhead coiled up, seemingly hoping to go undiscovered and using its camouflage. She kept saying "it was ready to attack" and then went on to say she killed it. Lady, it was hoping to go unnoticed by a creature much larger than itself, and you killed it and assumed it was going to attack (technically, defend itself. She made it seem like a tiger stalking her.) People pointing to the king snake and telling their children "that's a good snake" then going to the copperhead and saying "that's a bad snake." Educate your children on venomous (hell, even use poisonous since that's the term most people use) and non-venomous snakes. Don't say good and bad. Because great, another generation who'll slaughter any snake with a pointy head. Teach them to avoid the venomous snakes instead of killing, as many bites come from attempted killing of snakes.
A couple of college-aged guys bragging about taking a picture of the reptiles with the flash after reading a sign that said no flash and explained it stresses the reptiles and amphibians. They didn't take a pic, but they just laughed and said "what if I did that" and continued laughing. Yeah, stressing the animals is hilarious if it isn't cute or majestic.
A lady, in the African area, near the sign saying "African Savanna", right in front of the sign that says "African elephant", asking if they were Indian elephants.
There's more I've seen in my volunteering days, but I've shared more than enough. Apologies, but I kind of needed to rant, lol.
One story when I was just a visitor at Zoo Miami, I was speed walking back to the dhole exhibit after missing them earlier that day. I literally went to the zoo with the dholes at the top of the "new animal list" after finding out they came to Miami. I know the sign I read earlier that day said keep quiet and explained the dholes were shy and adjusting. So there I am, quickly walking to find them before the zoo closes, and I'm nearing the exhibit. What do some kids nearby decide to do? Scream and run for no reason. I knew the dholes were gone at this point. Luckily, I ended up seeing them after rushing past the screaming kids. So yay for that!