Pikmin extinction

Pikmin extinction occurs when every single Pikmin, including those planted in the ground and stored in the Onions, is lost. The day ends immediately and the Onions each produce a single seed at the beginning of the following day.

In Pikmin 1, the following is Olimar's Journal entry on the first day extinction occurs:

The Pikmin have all perished because of my own carelessness. I am an utter disgrace as a leader... How can I continue to collect parts without them? Still the Onions join me in low orbit, as if this Pikmin extinction had never happened. I shan't sleep tonight...

Many fans regard Extinction as being "childish", "careless" and even "cruel" due to the fact that after extinction, the player must regrow all of their armies from scratch.