Reader Mike A. writes in: "While traveling in the greater Boston area, we noted an unusually high number of dead squirrels. On one 20 minute ride we counted 14 dead squirrels hit by cars. Any explanations would be appreciated." I'm trying to get to the bottom of this as we speak, but I thought I should get the word out as soon as possible in case any readers can offer an explanation. Curiously, last weekend I walked all over northern Brooklyn with an eye out for squirrels to photograph and did not see a single one. Which is why you have not seen a weekly squirrel here today, among other reasons (and I think you reasons know who you are). Developing...