Who is birds lays the largest clutch of eggs?

The gray partridge lays the largest clutch of eggs among all these. The grey partridge also known as the English partridge, Hungarian partridge, or hun, is a gamebird in the pheasant family Phasianidae of the order Galliformes, gallinaceous birds. The grey partridge is a rotund bird, 28–32 cm (11–13 in) long, brown-backed, with grey flanks and chest.

The belly is white, usually marked with a large chestnut-brown horse-shoe mark in males, and also in many females. Hens lay up to twenty eggs in a ground nest. The nest is usually in the margin of a cereal field, most commonly winter wheat.