Referring to an elephant by her, he, and himself. Since when?!
I read these two questions on an English-website.

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Q: How do you keep an elephant from charging?

Take away her credit card!

Q: Why did the elephant paint himself different colors?

So he could hide in the crayon box!
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Can somebody explain?

Question

Referring to an elephant by her, he, and himself. Since when?!
I read these two questions on an English-website.

//
Q: How do you keep an elephant from charging?

Take away her credit card!

Q:  Why did the elephant paint himself different colors?

So he could hide in the crayon box!
//

Can somebody explain?

Answer

Animals are generally refered by 'it'. But if our relation to an animal is personal, like pets or if we have known them for quite a while now, then it is okay to use him/her.
 The personal him/her are also usually used for animals in Children's books/ poems.

Answer

There isn’t a fixed rule about it. I would say in this instance it’s because it’s a joke, maybe, i.e it’s lighthearted, non-serious, non-literal language. You might find this interesting: https://video.newyorker.com/watch/comma-queen-that-vs-who?c=series

Answer

Daphne - Thanks for explaining it. Those are jokes, by the way.

Answer

Riddle 1:
Charging can mean a lot of things. It can be by the way how an elephant attacks or another term for paying bills in Native English is "charging". For example, (a conversation between a seller and customer):
Seller: I will charge you $100. 
So in riddle 1, it is just a play on words.