Americans would be astounded to learn the usual settlements awarded for deaths due to traffic accidents (as an example I'm familiar with) in South America.
Payments of 25.000 dollars aren't uncommon. Colombia and Uruguay pay around U$ 150.000 per death. Heck, even first world countries like Spain can pay less than that.
So, an expensive monkey pet can be more expensive than a human.
http://www.therichest.com/luxury/most-expensive/10-most-expe...
https://www.scoopwhoop.com/Most-Expensive-Pets/
(Spanish) http://sociedad.elpais.com/sociedad/2014/04/08/actualidad/13...
By that reasoning, oughtn't we grant the same rights to a sea sponge?
It's not clear to me that animals, as a general class, deserve any particular care or rights beyond what we might extend to living creatures in general. So far as we grants rights to animals, the clear criteria seems to be complexity (especially of the intellectual sort) and closeness to humanity.