It's a right bugger is that, Donuel. I wish there were no slugs eating my brassicas, no midges ruining my Scottish holidays, no adders to threaten my sandalled feet, no wasps building nests in my porch, no rats eating my bird food, no blue mould to spoil my bread. Every organism has its place in the ecosystem. It's perfectly legitimate to show any organism on the planet that we're boss. It should never be in our gift to seek to eliminate a species completely. It took three billion years to get life to where it is, with all its intricate and wonderful interrelationships and interactions. We don't understand one tenth of it as yet, and it behoves us to not blunder in and wipe species out for our advantage. Not yet, not by a country mile.