"It's one thing to burgle a house but to kill animals is one step too far. What happens when they are older? What will they be doing then?"
He said the four baby birds had been in a tree outside the house and the family had watched their development. It appears the thieves used the same chair to reach the nest, smash it to the ground and then stomp the baby birds to death.
"They just didn't fall out of the nest. They were mangled, squashed and were in bits."
Police were due to carry out finger printing yesterday.With warmer weather on the way people would be wanting to open up windows and potentially leave homes susceptible to thieves.
Senior Sergeant John Fagan said properties should be made secure and that included locking all windows.
"If people can see windows are open from the street they are looking for every opening just to get into a house," Mr Fagan said.
"Even upstairs windows are fair game and those who are determined to get through will find things around the house, like chairs and ladders, to access them."
He said there was also a trend for cars parked on streets and even in driveways to be broken into and stolen, particularly around the Otangarei area.