The blue pikmin are extremely useful in gaining access to new areas. Annoyingly, I've rolled out a few bridges over water which other pikmin don't seem to be too keen on keeping to - I've lost a fair few yellows and reds (and a couple of purples) when they've decided that walking on the bridge was far too sensible and they wanted to skirt around the outside into the river instead. Survival of the fittest.
Pikmin 2: a veritable army by day 18
The blue pikmin are extremely useful in gaining access to new areas. Annoyingly, I've rolled out a few bridges over water which other pikmin don't seem to be too keen on keeping to - I've lost a fair few yellows and reds (and a couple of purples) when they've decided that walking on the bridge was far too sensible and they wanted to skirt around the outside into the river instead. Survival of the fittest.