Animal Intelligence

I found these three videos on the intelligence of three very different animals: crows, octopuses, and pigs.

All three have in recent years astonished researchers by showing themselves to be significantly more intelligent than had originally been thought. All three are among the most intelligent animals on the planet.

But notice the difference in tone in the video about the pigs. Pigs are often regarded as the most intelligent non-primate and non-cetacean, but the video about them is filled with euphemism and even mockery. Somehow, their status as "food" means that we don't have to take the implications of their intelligence seriously.

It was also much harder to find a video on pig intelligence - apart from the Compassion in World Farming video.

What do you think? Is there a bias against farmed animal intelligence? Do we deliberately observe farmed animals to be less intelligent?