You can even use an old-fashioned wire to hook them up to less-portable devices a desktop computer or CD player, for example.

WSJ: Big Sound, Wire-Free: Audyssey Bluetooth Speakers | Geek Chic

On top of all this they were able, in a different sort of test, to bend a piece of wire into a hook to retrieve a bucket containing a waxworm.

ECONOMIST: Tool use by non-tool-using animals