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Yes, like all birds, the eggs must be incubated to hatch.
You must have patience and let nature take its course.
To keep them warm so they can hatch.
If eggs are to be incubated for hatch, they must be fertilized. That is where the rooster comes in.
It all depends on which kind of Egg; Riolu eggs take longer to hatch than say, a Caterpie Egg. To be sure, go to Bulbapedia.org or Serebii.net (must-know websites for Pokèmon Fans)
They must hatch from eggs. Otherwise they can't learn it
They do not. A mother black mamba will guard her eggs, but after the eggs hatch the young must fend for themselves.
No..They would be eaten, and they must be buried in the sand to hatch..
you can't you must walk around with the egg in your party.
No. Reptiles must lay their eggs on land. If a reptile egg is submerged in water the embryo will drown.
unicorns aren't real but if you must know its a secret leprechauns hatch them from magical eggs
No the hen must sit on the eggs to keep them warm, or use a heat lamp.