On 16/09/2016 10:25, Muddymike wrote:
I have a plastic dustbin in use as a water butt one side of my
greenhouse. I lift the lid and dunk the watering can to fill it.

I often find slugs around the inside of the bin rim and knock them into
the water. They always sink towards the bottom but more appear quite
regularly, hence my question.

Mike
Maybe they can survive under water long enough to crawl up the sides
to the top.