The past participle is the form of a verb, typically ending in -<em>ed</em>.
The words <em>dripping</em> and <em>damaging</em> are present particples. A present participle is a form of the verb ending in -<em>ing</em>.
<em>Having heard</em> is a perfect participle. A perfect participle consists of the word <em>having</em> and the past participle of the verb. In this case, <em>heard</em> is the past participle of the verb <em>hear</em>.