Growing food

Topic: Growing food
Subtopic: Animals in permaculture
Age: 7 - 12
Holistic Planning: Hand
Details: Experience the 'cascade of intervention' when dealing with an animal 'pest', e.g. If there is a slug, 1) what happens if you do nothing about it? 2) What happens if you pick off the slugs (what time of day is best to do this?) or protect plants with a copper? 3) If that doesn't improve the slug 'problem', is there something you could bring in that would eat the slugs, e.g. Indian Runner Ducks? 4) If that still can't work, can you add something mineral or mechanical e.g. salt. 5) Only if all else fails, consider whether to use organic slug pellets and how that would effect everything in the garden.