Also, wait- this is technology (and arguably an alternate earth) so uh- #ArtWeeklies !
The lore of this thing is it's a giant military walker. As for why it's designed to look more like a creature, perhaps it's for intimidation, or maybe as part of decoration. Perhaps the culture that constructed it can afford to design their stuff just to look cool to boost moral, and as a show of display.
Another possibility is that it was originally designed for civilian transport, and so it was designed to be more creature- like as a means of appealing to customers.
Or maybe the designer of the creature is also an artist, and because they're a super genius, they're able to get away with whatever they want!
And yes, the kneecaps do indeed double as laser cannons! 
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