Hmmm.. Fossicking. I've just learned a new word.
Cat(h)

;-) I have no idea of its origins or even if it's a 'real'
word but it does
describe such an action perfectly.
Sacha

It's real enough - I wondered if it was ultimately derived from
Latin 'fossa' meaning a ditch or excavation, but according to
Chambers Dictionary, it is an Australian term, possibly
connected with an English dialect word meaning a troublesome
person.