After I’d already gone to visit the Hall of Monuments for my armor pieces, I figured I could also go and charm the HoM pets with my ranger. Charming pets in Guild Wars 2 is really easy. You just hit “F” when you’re near a “juvenile animal” that you haven’t charmed before and it gets added to your collection.
The pets that you get through your Hall of Monument can be found walking around there. The Jellyfish is found in the water.
If you don’t have the required Hall of Monument points, don’t worry, though. All you are missing out on are the looks of the pets. As the wiki page says, there is always a regular pet to be charmed in Guild Wars 2 which has the same skills than one of the HoM pets. So there is no need to grind those HoM points… unless you want the look, of course. But even then, there are similar skins available.
The black moa is exclusive to the Hall of Monuments reward. But what about a pink, blue, white or a red one instead? Those you can get in Guild Wars 2 without having HoM points! The black widow spider is exclusive, but there’s also a cave spider, a forest spider and a jungle spider. Seriously… 4 spiders, was that really necessary? Bah! I very much prefer moas, thank you very much. Although the rainbow jellyfish isn’t any better, if you ask me. The only good thing about that one are the colours! The ones you can get without Hall of Monument points are blue or red. If you love the white raven, on the other hand, your alternatives are less. Well, to be exact, there is exactly one. And of course, the white raven requires 25 points in the Hall of Monuments. Then again, why worry about having such a tiny little bird if you can have a huge big moa instead? ;)
By the way, one thing I didn’t know until after I jumped into the water with my ranger for the first time, is that some pets are amphibious, meaning that you can have them with you above and below the water. The Juvenile Brown Bear and the Juvenile Jungle Stalker are both amphibious, for example.