Poo mosses (family Splachnaceae) are world famous (among moss enthusiasts) for often growing on dung and rotting animals and enticing flies to disperse their spores. Poo mosses one of the few examples of a "lower plant" using insects for dispersal. Many flies are big fans of poo and rotting carcasses, just like poo mosses, and fly just where poo mosses want their spores to go.
Have a close look at Colin's photo. It's a distinctive and attractive moss. If you're from down south, it would be fantastic to get more observations added to NatureWatch NZ. It would also be great to know more about it, including where it grows, whether it is associated with poo or carcasses in New Zealand, and whether flies are dispersing its spores. We also don't know yet whether this is a rare vagrant blown from Tasmania or a permanent member of the Stewart Island flora.
New Zealand has an expert on these mosses at the University of Auckland, Anne Gaskett. You can hear Anne talking about her research on Tayloria mosses on Radio New Zealand's Our Changing World programme. Te Papa botanist Leon Perrie also has a nice blog post with more about poo mosses in New Zealand.