Entering your own formulas. To generate a list of random text strings you can use a formula based on INDEX RANDARRAY and TEXTJOIN. To generate a list of random numbers select cell A1 click on the lower right corner of cell A1 and drag it down.
This will take you into the Formula Builder tool.
Cells where your group names are written for each sampleanimal. It will give you an integer number between the two specified numbers only. Set up a new workbook and type in the data as per above. You can enter your own formula.