This video from New Zealand says about itself:
13 December 2014
This kokako from Tiritiri Matangi was filmed feeding on juicy leaves.
From the Bird Ecology Study Group about this:
North Island Kokako feeding on leaves
03 Jan 2015
“The video clip below was taken on Tiritiri Matangi Island, New Zealand. The island has been kept free of pests like rats, stoats and possums so that endemic bird species, which are mostly poor flyers, have a chance to re-establish their numbers.
“The tagged bird was seen on a branch at almost eye level, next to a path we took while returning to our waiting ferry.
“The bird can be seen holding down the leaf with one leg while tearing off bite-sized pieces to savour. After devouring the whole leaf, it hopped off to harvest another delectable juicy leaf.
“Its blue wattles and black mask gives away its identity.”
Teo Lee Wei & K
14th December 2014