Image courtesy National Zoo. We’re sure a visit to the National Zoo is the last thing on your mind on this wintry morning, but DCist never falls down on the job when there’s a new baby animal to coo over, snow be damned. Two of the Zoo’s black and rufous giant elephant-shrews, or sengis, had a little baby elephant-shrew several weeks ago, but zookeepers in the Small Mammal House only announced they discovered the…