I suspected as such. In my life, I've often heard this point trotted out to justify "Why men/women are good/bad at X thing", which is why I was asking what they were getting at, specifically. Even if they weren't getting at that, their comment doesn't add much by itself.
In fact, very few behaviors are specific to only humans.
We aren’t that special. At the end of the day, we’re just very clever mammals.
This is a difference in scale not a difference of kind.
It's not an argument about scale. "Dogs Playing Poker" is not based on anything real.
I am positing that, in fact, most of how we spend our time as human beings (such as arguing on YC news threads) is behavior which does not exist in the rest of the animal kingdom.
That is not an argument about scale as you say, it is an argument about the type of behavior.
It is fundamentally different.
The range of behaviors that Humans have is fundamentally far, far more broad than animals, because we are much more intelligent creatures. Example from a few thousand years ago: Farming, Cooking food. More recent examples: Fixing cars, doing taxes. Most of what Humans spend their time doing these days are things that animals don't do in nature.
Human cultures like to ascribe gender roles to most of these things, but in reality most of what people do doesn't have any implicit gender role associated with it, since it's pretty far removed from biological functions at this point.
Even in nature, the things people and animals do doesn't always neatly align with gender roles. For example, child rearing or even bearing live young is sometimes done by the male, even though it's usually a female gender role.
What's different between us and animals (as is usually the case) is our big thinky brains, and the things which follow on from that.