Professor Lindsay Matthews, from the University of Auckland, has been spending a lot of time toilet training the young - young cows, that is.
In a peer-reviewed study published today in Current Biology, he shares how 11 of 16 calves he trained learned how to use a 'moo-loo' in about the same time it takes for kids to learn.
The research could be seriously good environmental news. He spoke to Corin Dann.
