Egg Demonstration, Prague

Eggs are common among invertebrates, including insects, spiders, mollusks, and crustaceans.
• Fish and amphibian eggs
The eggs of fish and amphibians are jellylike. Fish eggs are fertilized externally, typically with the male inseminating the eggs after the female lays them. These eggs do not have a shell and would dry out in the air. Even air-breathing amphibians lay their eggs in water, or in protective foam as with the Coast foam-nest treefrog, Chiromantis xerampelina.