Please follow these steps:

  1. Go to 'Groups' tab and create a group - I have called mine, 'Archive Animals'
  2. Go to 'Animals' tab and select the animals to archive
  3. Press 'Action' then 'Add to Group' and select the group you created 'Archive Animals'
  4. Go back to 'Groups' tab and tap your 'Archive Animals' group. Then tap 'Group Action' top right.
  5. From the menu, select 'ARCHIVE' to archive all the animals in this group.
  6. Finally, press 'ARCHIVE GROUP' to confirm you want to archive all these animals.

Job done!