We all have different winter strategies. These goldfish seem to be frozen under the ice on Henry St. I don't know from fish, though some frogs do it, essentially turning on the natural anti-freeze around their cells and freezing all winter. There's an Arctic moth larva that takes a dozen years to mature because the summer up there is so short it only grows a little each season before freezing up again.
These rocks might have been deposited here by the ice sheet. Or, they may have been piled up by contractors at the still under-the-shovel Brooklyn Bridge Park.
These trotskys are starting to freak me out.