Editing Blue duck (section)

===Diet===
The blue duck feeds almost entirely on aquatic invertebrate [[larva]]e. A study of blue ducks on the Manganuiateao River in the central North Island found the most common prey items were [[Chironomidae]] (midge) and cased [[caddisfly]] larvae, although cased caddisfly were less preferred and were only consumed so much because of their abundance. [[Hydrobiosidae]] (free-living caddisfly) and ''[[Aphrophila neozelandica]]'' ([[crane fly]]) larvae were also frequently eaten. Other prey included [[mayfly]], ''[[Aoteapysche]]'' (net-building caddis) and [[Plecoptera|stonefly]] larvae.<ref>{{cite journal |last1=Veltman |first1=C. J. |last2=Collier |first2=K. J. |last3=Henderson |first3=I. M. |last4=Newton |first4=L. |date=1995 |title=Foraging ecology of blue ducks ''Hymenolaimus malacorhynchos'' on a New Zealand river: implications for conservation |journal=Biological Conservation |volume=74 |issue=3 |pages=187–194 |doi=10.1016/0006-3207(95)00029-4|bibcode=1995BCons..74..187V }}</ref> The blue duck on occasion take berries and the fruits of shrubs.<ref name=iucn/>