Where did the name Rhinoceros come from, and why is everything named after animals?

Interested about some general knowledge about the software.
As stated in the title, How did Rhino get the name Rhino and whats with all the animal names?

‘Nov 1993 - Sculptura 2 nicknamed Rhinoceros.’

Cheers

The legend goes that Michael Gibson, who worked on Sculptura, was a fan of Rhinoceri and had pictures of them hung up in his workspace - hence how the project got its nickname - which was, again according to the legend, somewhat of an in-house humorous reference.

After that the trend of naming the other products in the McNeel software line after animals continued, and that has spread to many people who have created plug-ins and accessories for Rhino plus Grasshopper.