Meerkat is almost twice the size than most tamarin species. Only fat lion tamarin specimens in captivity can reach it sizes.
GLT is just smaller, I saw them both last week and I’d say the average GLT is like three quarters of the size of a meerkat.
Glt: 65 cms at max - 48 at minimal
Cotton top: 66 cms at max - 53 at minimal
Meerkat: 60 cms at max - 48 at minimal
White tuff - 48 cms on average
(To lazy to find GLT, cotton top and meerkat avarege size, but you get the point)
While yes, most species of tamarins are 20 - 30 cms on size, hence smaller than the smallest meerkat, three of the most popular ones are still on the size range of it, and dwarvens they offsprings.
Not like we will receive a tamarin that isn't the glt, but still.
I see we are back to ignoring the fact that the Walk-through exhibit can be just as open-topped as the habitats.
"Can't wait to go to the zoo and see the open top bat enclousure!"
We aren't ignoring it btw, it's just a irrelevant information in this context.