Some do some don't. No body knows why this happens. IMO it is linked to the spider gene and maybe why some show it and others do not may have to do with if the spider has one or two copies of the spider gene EX. both parents are spiders or one parent was a spider. The combination of two spider genes does not affect the appearance of the animal and may not do anything else who knows but it may compound the wobble effect.
But this is just my theory. Again if you like them then get one, if you breed it you may or may not get wobbles.

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