Teams swap characters when they swap batting. Dressing the ball up as a stowaway (e.g., put it in a sock) is encouraged, as is decorating islands.
The batter is the biosecurity officer who’s trying to find the stowaways and hit them away from the island (batter’s square). If the stowaway ends up with the other invasives (caught by a fielder) then it can reproduced and the conservationist is out.
As the bases are islands, if a player is stumped it means the stowaway gets to the island before people can protect it and the biosecurity officer is out.
After stopping on an island (base) the biosecurity officer has to name three birds they can see on the island and do an impression of one of them.
When someone scores a full rounder the other batters have to do a victory lap of their best bird impressions.
An introduction to biosecurity and why it matters. Includes outdoor games
Researching seabirds including tasks, model building and games
How to help seabirds including games, treasure hunts and identifying tracks
Setting a design challenge and biodiversity action planning
Groups present and evaluate ideas including news-reading, games and writing
Spreading the word including stories, map activity and games