Chris Packham has returned to the UK after he was questioned for four hours by police in Malta as he tried to film the illegal hunting of migrating birds.
The naturalist and TV presenter said rare species were being targeted, and hunters were even shooting Montagu's harrier birds on the ground at night.
Mr Packham, from Hampshire, described Malta as an "avian apocalypse".
He was questioned after the hunters demanded the police investigate his alleged defamation against them.
Lawyers for FKNK, the hunters' federation on Malta, also asked the police to look at a transgression of data protection laws.
In Malta, if a lawyer lodges such a demand, the police are legally obliged to investigate.
Mr Packham, who is based in Marchwood, in the New Forest, was in Malta making a series of short video blogs for YouTube.
He voluntarily attended the police station where he was questioned.
Mr Packham, who has presented BBC Springwatch and more recently, Inside the Animal Mind, said: "Ultimately I want something positive to come out of this.