Free-range eggs are eggs produced from birds that may be permitted outdoors. The term "free-range" may be used differently depending on the country and the relevant laws, and is not regulated in many areas. Eggs from hens that are only indoors might also be labelled cage-free, barn, barn-roaming or aviary, following the animal happiness certification policies, also known as "happy chickens" or "happy eggs". This is different from birds that are reared in systems labelled as battery cages or furnished cages. Legal definition Legal standards defining free range can be different or even non-existent depending on the country. Various watchdog organizations, governmental agencies and industry groups adhere to differing criteria of what constitutes "free-range" and "cage-free" status. United States The United States Department of Agriculture (USDA) requires that egg producers be able to demonstrate that "free range" egg layers have access to the outdoors, though there is no government oversight as to the quality of the external environment, or the amount of time the hen has access to it. Many producers label their eggs as cage-free in addition to, or instead of, free-range. Recently, US egg labels have expanded to include the term "barn-roaming," to more accurately describe the source of those eggs that are laid by hens which can not range freely, but are confined to a barn instead of a more restrictive cage. Debate Cage-free eggs have been a major cause of debate in the US. In 2015 there was an initiative proposed in Massachusetts that would ban the sale of in-state meat or eggs "from caged animals raised anywhere in the nation". This shift from caged to cage-free is concerning for egg industry groups because they believe that this will cause the price of eggs to increase to the point that consumers can not afford to buy them, thereby causing a decline in the egg industry overall. Animal welfare advocates argue that costs will not change as drastically as industry groups are expecting and that the price of eggs will remain almost the same because the housing of the birds does not make a huge difference to cost. Egg industry groups are making an effort to show or "educate lawmakers, voters and consumers about the merits and cost-effectiveness of cage use". Local farmers and producers say that the shift will occur if that is what consumers want, they will adapt to having birds in or out of