It's not only banner-waving activists who care about animal welfare, a recent government report found the majority of people surveyed have concerns and want reform.
We're on the way to making machines that appear and act human, and can think for themselves. So how will they react to our behaviour towards them, especially the bad behaviour?
Recognising animals as sentient means welfare laws must consider animals' feelings as well as their physical conditions.
Capuchin monkeys understand fairness, sheep recognise their friends, rats make sacrifices for buddies. Yes, animals are sentient. Here's the science.