The nice kind, that is. These pigs don't go beating up and manslaughtering peaceful people in the city of London.
It's now illegal under certain circumstances to take photographs of the other species of pig. Section 76 of the Counter-Terrorism Act 2008 makes it a criminal offence to take pictures of pigs 'likely to be useful to a person committing or preparing an act of terrorism'.
Of course, even before the G20 protests it was obvious why that was. Recent examples also show that it appears to be up to the discretion of the pig concerned, as to whether a photographer might be a terrorist or not. http://www.bjp-online.com/public/showPage.html?page=836646
Only in this country...
Only under this government...
I'm assuming however, that photos of the nice kind of pigs are definitely not illegal. So here's a lovely picture of a pig, taken near Beachy Head earlier this spring.