Dead and euthanized birds after the injection of SRBC.

The first column indicates the pen number; the second column indicates the corresponding treatment (CSTR/NSTR referring to the Cold Stress or No Stress treatments and SENV/CENV referring to the Simple or Complex Environments respectively); the last column lists the identity numbers of the birds in the pen; the birds that died are marked in dark grey and those that had to be euthanized are marked in light grey.