Yes , whenever I can I engage diplomatically but assertively with anti zoo and animal rights "activists" who are able to carry out a civilized conversation because I feel it is important for us in conservation to be able to negotiate , discuss and listen to views that oppose our own. Whenever I talk with these kinds of people I endeavour to present them with a balanced , scientific (but not arrogant ivory tower) and rational argument for the need for good and ex-situ conservation focused zoos and captive breeding programes as a necessary complement to in-situ conservation work. Sometimes it works and people will be able to see what it is I am trying to articulate but often there is no common ground or these kinds of people are too entrenched and indoctrinated within their ossified world view / removed from the reality of conservation to be able to conceive of zoos as being anything other than "Cruel prisons". In those situations the only conclusion that can be reached is "I respectfully disagree with your opinion but believe you are entitled to hold it". However, I don't talk to screaming fanatics and those who try to shout down, lie about, blackmail or bully me or my colleagues in conservation will be called out and ALWAYS confronted head on. All I can say is similarly those "activists" who try to physically push or bully me or my colleagues ( and this does happen in conservation suprisingly frequently) around really will have picked the wrong person to pick a fight with. I have absolutely ZERO compunction or inhibitions about defending myself or my colleagues. But I would like to broaden the definition of just who and what "the enemy" is because ultimately in my experience the "enemy" is not just the animal rights activists and can actually be found internally within conservation itself. For example, it also comprises lazy ,uninspired and mediocre management of zoos or NGO's that refuse to move with the times or contribute anything meaningful / tangible to conservation and live like parasites off the funding derived from the public. I also think another formidable (but less talked about / acknowledged enemy) is a particular kind of arrogant , petty and narcissistic ivory tower academic ( to be contrasted with the many decent and principled academics and scientists) and their PhD students who are removed from the reality, risks and sacrifices of real world conservation. They scare / drive a good many decent people away from conservation, seldom care about commitment to long term conservation strategy or "fighting the long fight" or "boots on the ground" but instead only about publishing scientific papers to further their academic careers, they stultify , sabotage or impose group think or cloak and dagger bullying dynamics and tactics on the wider conservation world. They spend a couple of months at most in the field but all the while they play the virtue signalling role of the hero on twitter and in news publications while strutting around self importantly their university campuses and offices in the First world. I've even seen some of them have the gall and shamelessness to virtue signal through tweets about environmentalists and conservationists in Asia , Africa and Latin America who are gunned down and butchered in ever increasing numbers every year and who give their lives to protect the environment and biodiversity. I think of all the "enemies" it is the latter cowardly kind found in ever increasing numbers in academe that I have the least respect for and I'll admit that I have far more respect for even the more fanatical animal rights activists as adversaries than for them.