Shouldn't it be groupos indígenos with an "o"?
Freeform Writing Exercise B1
It's the same with both masculine and feminine nouns
The adjective (and also noun) "indígena" has the same form for both masculine and feminine, as Marsha said. Here are some examples:
La muchacha indígena nos mostró su casa.
The native/indigenous girl showed us her house.
El hombre indígena nos habló de las tradiciones de su gente.
The indigenous man talked to us about his people's traditions.
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