Why does laying eggs on the ground result in fewer partridge compared to the birds that lay eggs in nests in trees?

Laying eggs on the ground exposes them to higher risks from predators, environmental factors, and harsh weather conditions, which can lead to higher mortality rates in the eggs and chicks. In contrast, birds that nest in trees benefit from increased safety from ground-based predators and better protection from the elements. This enhanced survival rate for tree-nesting species contributes to their larger populations compared to ground-nesting partridges. Overall, the choice of nesting site significantly impacts reproductive success and population dynamics.