Animal is best understood as a program family rather than one fixed product. The familiar BASIC listing tradition credits Arthur Luehrmann at Dartmouth, with later shortening and modification by Nathan Teichholtz at DEC and Steve North at Creative Computing. David H. Ahl’s BASIC Computer Games helped make programs like Animal part of a wider portable BASIC culture.
That matters because early home-computer software often moved by being retyped, edited and adapted. A program could appear in a book, then a magazine, then a machine-specific version, then a later emulator bundle. The “same” game could therefore have many local forms.
A compact timeline
- 1970s: Animal circulates in BASIC and mainframe/minicomputer contexts.
- 1978: BASIC Computer Games publishes Animal as one of many portable BASIC programs.
- May 1983: Ralph Kennedy’s Sinclair/Timex Guess That Animal appears in Compute!, adapted for the ZX81/Timex-Sinclair world.
- May 1991: Atari ST User Issue 63 carries the ZX81 emulator cover disk remembered below.
The ZX81 angle
The ZX81 version is interesting because of how it could preserve learned data. Rather than saving a separate modern-style database file, the ZX81 approach could rely on reloading a program without losing previously saved data. In practical terms, the learned animal tree could survive because the program state was saved along with the BASIC program.
That is a charmingly period-specific form of memory. The program did not have a cloud account, a server database or a sync process. It had the machine’s own storage habits and the user’s willingness to save the session.
The Atari ST emulator memory
Although our family owned a ZX81, I don't remember trying Animal on it. Much later, though, I came across it on a ZX81 emulator for the Atari ST, from the cover disk of Atari ST User Issue 63, May 1991. You can see the whole magazine here, courtesy of Atari Mania.
That route is part of the appeal of a modern browser remake. It adds another layer to the same chain: a tiny early AI-like game encountered through old machines, magazines, emulation and remembered fragments, now reimagined as a lightweight web console.
Why not recreate one exact version?
A faithful recreation of one listing would be possible, but it would also narrow the project. This site instead recreates the common experience: think of an animal, answer questions, teach the machine when it fails, and gradually build a small local “brain”.