Watch out for Ridley's large fireballs, his tail will also cause trouble often. It'll be difficult to avoid colliding with the monster, thankfully you won't lose too much health with each hit (especially with so many Energy Tanks).
Bosses officially designated as Mini-Bosses are marked with an asterisk (*). Bosses are very powerful enemies that often guard or possess a power-up which Samus Aran must kill to obtain the item. You'll be treated to a remake of the classic boss theme from Super Metroid during this battle so it won't be too bad.

This page is a list of bosses in the entire Metroid series.