checking for certain words

The following code will open one of two user forms depending on the value found in the spreadsheet:

HTML Code: 

How can I check for either Aardvark, Moose or Zebra using this code?
If either of these three are there, UF21 should open, otherwise UF8.

Thanks for your time.

Use the select statement

Select Case UCase(ActiveCell.Offset(, -2).Value)
Case "ARDVARK", "MOOSE", "ZEBRA"
      UserForm21.Show
Case Else
    UserForm8.Show
End Select