Pikmin/The Impact Site revisited

There are lots of food pellets near the ship, and there is only one part left, but don't get sidetracked because there is a lot to do in this region. This is a good place to come back to later though if you have an extra day and just want to build up your Pikmin numbers. The first thing to deal with is a boss, and which boss you get depends whether it's an even or odd number of days since impact.

Preliminaries
Start with at least 20 Yellows, 20 Reds and as many Blues as you need to get to the 100 Pikmin limit. Head north through the gap where the cardboard box was, then left over the box into the large circular area. Getting 100 Pikmin through these obstacles at once is tricky so you might want to make more than one trip. A new enemy you may meet on the way is the iridescent flint beetle, which looks just like its name. It won't hurt your Pikmin but they are irresistibly driven to attack it, so you may have to call them a few times to keep them in line. If you have the time, try throwing some Pikmin on top of it to make it drop some goodies.

Mamuta (even days)
This is a large gray ape-like thing. As bosses go it's actually quite gentle; it doesn't actually hurt your Pikmin but slams them into the ground, turning them back into sprouts. An interesting side effect of this is they are instantly advanced to the flower stage. Mamuta will damage your spacesuit if it hits you though, so try to stay out of range while you throw Pikmin at it. You don't want too many of your Pikmin turned into sprouts since you'll have nothing to fight with, so try to keep them away from its long arms. Reds will be more effective fighters in this battle, but it should be easy enough that you won't actually need them. When the battle is over you'll have a spend a few moments to re-pluck your Pikmin.