Eggs of all sorts are a major source of nutrition for many birds, though no birds are exclusively egg-eaters.

American Dipper

with salmonid egg in bill

American Dipper b57-12-001.jpg
American Dipper      Cinclus mexicanus
Canada; British Columbia, Victoria

Boat-tailed Grackle

female eating horsehoe crab eggs on horseshoe crab

Boat-tailed Grackle w02-47-034.jpg
Boat-tailed Grackle      Quiscalus major
USA; New Jersey, Delaware Bay

Hood Mockingbird

turtle egg in bill

Hood Mockingbird m47-9-043.jpg
Hood Mockingbird      Nesomimus macdonaldi

Laughing Gull

eating horseshoe crab eggs, big clump in mouth

Laughing Gull w02-47-082.jpg
Laughing Gull      Leucophaeus atricilla
USA; New Jersey, Delaware Bay

Laysan Finch

cracking open petrel egg

Laysan Finch r16-1-073.jpg
Laysan Finch      Telespiza cantans
Hawaii, Laysan Is.

Semipalmated Sandpiper

horseshoe crab egg in bill

Semipalmated Sandpiper w02-53-213.jpg
Semipalmated Sandpiper      Calidris pusilla
USA; New Jersey, Delaware Bay

Shorebird sp.

feeding on horseshoe crab eggs, red knot, Short-billed Dowitcher, Dunlin, Laughing Gull

Shorebird sp. w02-53-227.jpg
Shorebird sp.      Scolopacid sp.
USA; New Jersey, Delaware Bay

Snowy Sheathbill

eating King Penguin egg among penguins

Snowy Sheathbill l07-28-013.jpg
Snowy Sheathbill      Chionis alba
South Georgia Island, Gold Harbor