How do you know if an egg has a chick?

Hello!! In this video you can learn how to know if an egg is fertilized, that is, if it has a chick, and how to differentiate a fertilized egg from an unfertilized one.
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[@inmamartin4860]

Muy interesante

[@Raquel_blox_pixel]

Holaaaa ya estoy alimentado a un pollito

[@josepiernagordapriego9856]

Buenas, parece que no es fecundo. Un saludo.

[@aviariomartin_]

Correcto