Why have my harpy pops stopped growing?

I have 3 planets with harpys as secondary pops but they have all stopped growing well before their planetary max even though I have built several farms. Eg: 10563km, 60% land mass, 23c.
Pop has stopped growing at 63,378 max pop stated 475,337.

They need Bio-Farms.

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F me… That’s a long way up the food chain

Yeah, it’s mid-game tech. Arguably should be available earlier.

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