(Settle on grassland riverside pigs).
Well, doing so gives you +1 Food in your City Centre, so it's not completely wasting the Resource. Also, this way, you can potentially delay researching Animal Husbandry because who needs a Pasture, right?
Finally, I'd rather settle on a Grassland Pig square than accidentally settle on a Grassland Horse square. At least in the former case, you will get a minor bonus to your City's Centre square. To add to this point: since there can only be one Resource on a square, you won't accidentally settle on a Grassland Horse square if you settle on a visible Resource!
So, you really can extend the delay of researching Animal Husbandry until you can get it in trade.
Of course, I don't support Flash since Macromedia (Adobe) tracks every user's view of Flash content, so I have disabled Flash support in my browsers and thus I am unable to view the video and am completely speculating just based on the clues that you gave. If nothing else, you may want to reconsider any viewing habits that you have of "questionable content" over Flash media--that is, if you care that your views of any such questionable content gets tracked, info that is likely to be later sold to Google or other advertisement companies.
I'd wish AZ good luck, but with Huayna, that would be overkill.