It shouldn't be eating sand. Something is obviously wrong, take it to the vet if it is a pet, or point it out to a keeper if it is at a zoo/sanctuary.
Mainly insects.
No, they cannot!
yesBecause they eat birds and and eat other things.
They eat 10 times a day
hawks
regular marmoset
A marmoset in a can, idiotic numbskull!
marmoset monkeys varriy in color
regular marmoset
pygmy marmoset habitat
Silvery marmoset was created in 1766.
Manicore marmoset was created in 2000.