summer in patagonia, and filming is in full swing. one crew is heading to bahia mansa, a quiet fishing village on the west coast of chile. they've been told it's home to the marine otter, known in patagonia as the chungungo. this enclosed bay may look like an easy place for filming, but it's a tough assignment. >> anybody see them? >> no, not yet. >> the crew only has five days to learn the otters' movements and capture them on camera. >> you heard them? they just cried out. >> having filmed chungungo before, cinematographer mauricio handler knows it won't be easy. >> they're sneaky. they're very sneaky. and they're very fast. for such a small animal, one minute they're there, the next minute they're gone.