A translation issue about alphabeavers?

[duduluu]

Hi, Tynan.
I know 'alpha' often means 'big' to animal.
But in the 'alphabeavers', 'alpha' seems to mean 'test animal'.
How should I translate this 'alpha'? 'big' or 'test?

[XeoNovaDan]

They're described as 'Genetically engineered', so my 5p would be 'test'