Probably a kiwi thing yeah, they're pretty iconic over there. Mars is the pretender.
Mars bars come from Slough in England and first appeared in 1932
Cut and pasted from WIKI
New Zealander/Australian variant
The New Zealand (now Australian) bar has a black wrapper with "Moro" written in yellow (see side photo). The slogan is "Get more go" due to its high energy content. This bar has a whipped nougat and caramel centre and is covered in chocolate.
There are three different types of Moro sold in New Zealand, the aforementioned 'standard Moro', the Moro Double Nut containing peanuts and hazelnuts, and the recently released Moro Gold, which is similar to the Irish Moro and the Boost Bar sold by Cadbury in Australia.
It is available in New Zealand, and a very limited number of stores in Australia, although Moro is one of the miniature chocolate bars found in Cadbury Favourites.
It is equivalent to the Australian or European Mars Bar, as well as being very close to the Australian Cadbury Whip, however within New Zealand it has eclipsed the Mars Bar,
becoming something quintessentially Kiwi as well as Cadbury's best selling bar within New Zealand. It's stated on the fun facts page of the Cadbury New Zealand website that a Moro bar is consumed once every two seconds.