There are ~7x10^9 individuals on the planet. It makes things a whole lot simpler, computationally, if we're allowed to categorise them. Sure, there are outliers who don't fit the categorisations, but pfft, it's easier to code for a limited number of exceptions than be forced to hold the whole population-space in memory.

The confusion here appears to be between Weta Digital and Weta Workshop.

Weta Digital is the _digital_ effects house, with all the computer support that entails, however, it is actually the younger of the two companies.

Weta Workshop is a _physical_ effects shop and has always been into hardware and robotics/animatronics.

As another poster mentioned, Braindead (Dead Alive in the US) and Meet the Feebles predate the Digital side of the business and more recent films, like Black Sheep, are more animatronic than CGI.

To Bring things back to topic, here's the page on Workshop's site: Ollie The Tuatara