PHILADELPHIA (AP) -- The Humane Society of the United States says undercover investigators have found deplorable conditions at a central Pennsylvania egg farm.

The agency said Thursday that the probe earlier this year found severe overcrowding, mummified bird carcasses, thick layers of dead flies and other unsanitary conditions during a six-week operation at Kreider Farms in Manheim.

A message left by The Associated Press with Kreider Farms was not immediately returned.

The Humane Society says investigators found severe overcrowding, with birds having only 54 to 58 square inches of space, which officials say is not enough for them to spread their wings. It also says investigators found birds partially trapped in cage wires.

The group is also calling for more support of federal legislation that would improve conditions for hens.

Copyright 2012 The AP.

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