The ISA Brown is a hybrid chicken developed in France by the Institut de Sélection Animale. Hence, the acronym ISA. For over 40 years, these brown hens have remained one of the top global egg layers. They are friendly and lay a dark copper color egg. They are low maintenance and can handle a variety of different climates. ISA Browns are hybrids resulting from a series of crosses which include Rhode Island White and Rhode Island Red chickens but the exact breeds have been a closely guarded by the company that owns this amazing bird’s patent.