When our ship had gone as far as it could without hitting too many icebergs, we all loaded
into Zodiac boats and went close to the glacier.  We got to within a half mile, and couldn't go
any closer only because so many seals were up on the small icebergs giving birth to pups.  
The guide said that if we spooked a seal mom when her pup was too young, they would both
go into the water before the pup was able to survive.