The broadcaster and wildlife campaigner Chris Packham has revealed he and his family received death threats days after dead crows were strung up outside his home in an escalating row about shooting birds.

He also criticised Facebook for allowing a pro-shooting group to publish his home address online.

The BBC Springwatch presenter has been subjected to a campaign of intimidation since the Wild Justice group he co-founded successfully challenged a licensing system that allowed the shooting of 16 bird species, including crows, jays and woodpigeons.

On Tuesday, he said the campaign against him had escalated, with “death threats of a very serious nature” being made against him and his family.

Speaking to the BBC’s Victoria Derbyshire programme, Packham said he received a letter on Monday “designed to elicit as much fear as possible”.

He said: “They have listed a whole catalogue of things they might do ... ‘we could organise a car crash, we could organise poisoning you, we could organise all of these sorts of things’.”

Packham also said he had been sent a package of human excrement in the post. He said it had been taken away by the police for analysis, and DNA samples had been taken.

He also condemned Facebook for resisting calls to remove his address from a pro-shooting group that had urged supporters to target Packham.

He said: “It’s so difficult dealing with Facebook. They are extremely resistant to these sorts of things. So unfortunately that address is out there. It is also out there with invitations to send me dead animals and all sorts of other things, so there is definitely incitement to violence. But Facebook – well, over to you.”

Facebook said it had investigated and removed several posts for breaking its rules by sharing Packham’s address.

Packham defended the Wild Justice campaign against a shooting licence, which was withdrawn last week, claiming it allowed people to kill birds for “pleasure”.

Facebook Twitter Pinterest Chris Packham tweeted a picture showing dead crows left hanging outside his home. Photograph: Chris Packham/PA

He said: “We were doing our duty as conservationists to raise this issue so that we could better protect birds which were being needlessly killed.”

Earlier, speaking on ITV’s Good Morning Britain, Packham appealed to those targeting him to stop intimidating businesses and charities he was associated with.

Packham said: “It is not just my family. It is businesses that I work with. I’m very resistant to this sort of thing. It is part of a process that I will have to go through to effect change and I’m determined to do that and I’m going to. So they can send me as much human excrement as they like.”

He added: “What worries me is that the charities that I’m affiliated with, the small businesses that I work for, these people aren’t set up to take this sort of abuse, and yet they’ve had to close their websites, their TripAdvisor accounts have had to be shut down, because they’ve been bombarded by these bullies who want to take aim at me.”

Hampshire police were investigating the threats, Packham said. He added: “My message is clear. Please, take aim at me, but leave all of the charities, all of the other businesses that I work with, leave them out of it. They are not necessarily sharing my views. They are not a fair target.”

Packham previously told the Guardian he would not be intimidated into stopping his campaign against bird-killing regulations after two crows were left hanging outside his home and a security gate glued shut.

“People like me, with Asperger’s, are not affected by this sort of thing. It doesn’t weaken our resolve,” he said.

Chris Packham (@ChrisGPackham) I’ve received another gift . . . pic.twitter.com/gwmEfUGm2u

On Sunday, before the death threats were made, Packham made light of another abusive package he was sent in the post. It contained a block of wood scrawled with a “badly-drawn penis and testicles”, he tweeted. In a video about the incident, he said whoever drew it “hasn’t got the balls to come and deliver the message themselves”.

He later put the “woodcock” up for auction on eBay to help raise funds for Wild Justice. It was bidding at more than £2,000 on Tuesday morning.