What is the core evolutionary trade-off seen in the 'Civilized strategy' finches residing in stable environments?

Answer

They can afford to raise fewer, but better-cared-for young

The Civilized strategy in stable environments allows finches to establish territories and focus resources on fewer offspring, leading to less stress and allowing sexual selection to favor highly ornamented males.

What is the core evolutionary trade-off seen in the 'Civilized strategy' finches residing in stable environments?
birdanimaldescriptionfinch