If Daisy the pig can recognise herself in a mirror, does that mean she shouldn’t be turned into bacon?

In the wake of a seriously busy #Februdairy, where activist rhetoric was thrown around like confetti at a summer wedding (my personal favourite activist claim – milking cows just promotes patriarchal societies in which females are treated like objects…), this little gem just arrived in my Twitter messages.

It’s a interesting little animation, probably aimed at giving food for thought (groan…), with the premise that if the animals that we eat for dinner (pigs, octopi, etc) are more intelligent than something that we wouldn’t eat (a human infant*), then should we be thinking twice about eating them?

There’s just one fatal flaw in this analogy – most livestock species are precocial. That means that when they’re born, they can quickly get up, feed and, if necessary, run away from predators. Not surprisingly, that can be essential for herbivorous prey animals in the wild. Animals that are not precocial are altricial – young are relatively undeveloped and helpless when born and tend to be hidden away in nests until they’ve gained maturity (e.g. mice).

Humans fall between these two extremes – gestation length is relatively long compared to other mammals, which favours increased foetal development and a higher birthweight, but human infants have smaller brains (29% of adult size compared to 40-45% in African apes) and have extremely immature motor skills. A significant amount of brain growth and development therefore occurs between birth and adulthood. Can an infant take the top off a child-proof medicine container? No. Can an adult? Absolutely. Does that mean that human infants lack intelligence? Not in the slightest. They just haven’t formed all the necessary brain and motor connections yet.

To try and compare the “intelligence” of a human infant with a fully-grown pig, octopus or sheep and draw any meaningful conclusion about whether or not we should eat the “intelligent” animal is an utterly futile comparison. Not quite apples to oranges, but close – after all, even the smartest apple can’t recognise itself in a mirror – or can it?

*Note that infanticide and cannibalism is practiced by some primates.