I think the speaker is saying "teaching shuttlecock."
I put my expensive headphones on and played this several times. I think
the speaker, who a really weird accent - I can't decide if it's a non-native speaker e.g. Chinese or a rural American such as an Okie - is saying "teach him shuttlecock". The voice has something of the congenital idiot about it. To my British ear it sounds like the speaker is saying "teach 'im shuddlecawk". If it is an audio capcha it is a very poor one.