It's a common mistake. I expect half the comments to be "oh, I do that too all the time". As with all my stranger stuff, this came to me at about two in the morning.

It's my first attempt to draw a tiger, so it's funny it came out better than the ferret. Perhaps because I drew the ferret after I drew the tiger and realised I had to draw it at most an inch high to get the proportions sorta right.

(More diligent artists would have erased the tiger to draw another, larger one, but to me, that is like renaming a ship for one that has been lost at sea, omitting to put a coin under the mast, and bringing women on board.)

Remember, tigers are endangered. It is wrong to set them on fire.

Lions, on the other hand...

And if you don't get the joke - shame on you!