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Furry families celebrate mothers in this week's Animal Tracks

A polar bear cub plays with its mother Uslada at the Leningrad Zoo in St. Petersburg, Russia on April 24, 2014.
A polar bear cub (L) plays with its mother Uslada at the Leningrad Zoo in St. Petersburg, April 24, 2014. The four-month old polar bear cub, who made its first public appearance on Thursday , is yet to be named. REUTERS/Alexander Demianchuk (RUSSIA - Tags: ANIMALS TPX IMAGES OF THE DAY)ALEXANDER DEMIANCHUK / Reuters