Irene,
You’ve described an active, engaging activity for a young class about animals in the cold.
You could add images of the poles (https://www.pmel.noaa.gov/arctic-zone/gallery_np.html) to support recognition of different conditions.
As a fun extra, with my Brownie Guides we sing;
but change the action (and the words) to hug X other polar bears,
and at the end of each round change the number of polar bears that have to hug (huddle together). We usually end up with all the girls in one big huddle.
This could give you some simple maths counting in a fun way.
