I would argue that suet is the most important food that you can put in your bird feeding station. During the winter months the calorie-dense blocks of beef fat sustain insectivorous birds that struggle to find their preferred food source. Birds that benefit most are woodpeckers, nuthatches, and a subject of a recent installment of this column, Carolina wrens. Suet is especially important to the wrens, birds more fit for the south, and it is one of the few things preventing a total loss of their local population which has plummeted dramatically over two brutally cold winters. I would also argue that suet can be one of the more dangerous foods that you can put in your bird feeding station. How so? First, let’s start off with a lesson about eggs. Human babies in the womb get their oxygen through the umbilical cord. Birds being birds and not mammals, they lack that connection to their mother. But, they still need oxygen, one of the drivers of animal life, and they need to expel car...