"I got a phone call from their father, who was very apologetic. You have to admire their dedication and passion to see their favourite bird win. It's great to see young people get excited about conservation," said Collins.
"...We're surprised that somebody would rig such a light-hearted contest and taint the name of such a beautiful bird" said 15-year-old Oscar, campaign manager for the kokako.
Forest & Bird said the contest was now in its eleventh year, and aimed to raise awareness of New Zealand's unique native birds and the threats they face.
Voting closes this Sunday at 5pm.
This afternoon, the Bar Tailed Godwit, described as a "lunatic long-distance flier" was leading the flock of 52 contenders with 1555 votes.
Last year, the Fairy Tern or Tara Iti won.
Forest & Bird had a "one person, one vote" rule and voters can make their pick at www.birdoftheyear.org.nz.