John Brennan is devastated after thieves stole scores of his birds and killed dozens more.
The attack, which lasted around 15 minutes, was caught on a CCTV camera inside the aviary.
Mr Brennan is now considering what more he can do to improve security.
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"She tried to take hold of the knife to stop him. He told her not to shout out and scream and get on her knees and beg."