Duck You !

[Bucket]

Firstly, get them and yourself off to a vet.

Get their wings clipped, because when they are fully grown, they'll be off like a shot at the first chance.

And trying to chase something terrier sized (for a big one) and can fly isn't fun (they don't fly much , but still a pain to catch if they decide to)

The vet should also know what sex they are.

For looking after them the best way, contact these fine folk http://www.domestic-waterfowl.co.uk/index.htm