Someone once said that a chicken is an egg’s way of making another egg.  The opposite, is true, too. 

In zoology, an egg is an organic vessel in which an embryo first begins to develop. In mammals, the egg is a single cell with half the normal complement of chromosomes, which is fertilized and develops into a zygote.

In most birds, reptiles, insects, molluscs, fish, and monotremes, an egg is the zygote, resulting from fertilization of the ovum, which is expelled from the body and permitted to develop outside the body until the developing embryo can survive on its own.

Oviparous animals are animals that lay eggs, with little or no other development within the mother. The study or collecting of eggs, particularly bird eggs, is called oology.

Reptile eggs, bird eggs, and monotreme eggs, which are laid out of water, are surrounded by a protective shell, either flexible or inflexible.

The 1.5 kg (3.3 lb) ostrich egg is the largest egg currently known, though the extinct Aepyornis and some dinosaurs had larger eggs. The Bee Hummingbird produces the smallest known bird egg, which weighs half of a gram. The eggs laid by some reptiles and most fish can be even smaller, and those of insects and other invertebrates can be much smaller still.

  1. 1.honey buzzard

  2. 2.falcon

  3. 3.Eurasian sparrow-hawk

  4. 4.blackbird

  5. 5.thrush

  6. 6.rook

  7. 7.corn bunting

  8. 8.hawfinch (or perhaps another grosbeak?)

  9. 9.sparrow

  10. 10.chaffinch (or other finch?)

  11. 11.pipit

  12. 12.reed bunting

  13. 13.cuckoo

  14. 14.hummingbird (?)

  15. 15.crossbill

  16. 16.wren

  17. 17.nuthatch

  18. 18.nightingale

  19. 19.Kinglet (Goldcrest?)

  20. 20.accentor

  21. 21.rock bunting

  22. 22.reed warbler

  23. 23.sedge warbler (or other Acrocephalus?)

  24. 24.warbler (??)

  25. 25.tit (?)

  26. 26.tree warbler

  27. 27.waxwing

  28. 28.oriole

  29. 29.jacana

  30. 30.grouse (?!)

  31. 31.lagopus

  32. 32.pheasant

  33. 33.partridge

  34. 34.quail

  35. 35.avocet

  36. 36.spotted redshank

  37. 37.dotterel

  38. 38.plover (??)

  39. 39.lapwing

  40. sandpiper

  41. 41.tern (??)

  42. 42.common tern

  43. 43.tern (??)

  44. 44.seagull

  45. 45.loon

  46. 46.guillemot

  47. 47.great auk

  48. 48.puffin

  49. 49.grebe

  50. 50.Emydidae (?)

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