I believe that the best answer for this question is an adjectival prepositional phrase because it describes a noun. It modifies the words "a pygmy hippo," which is the subject of the sentence and therefore a noun. Adjectival prepositional phrases modify nouns, while adverbial prepositional phrases modify verbs, adverbs, or adjectives. Hope this helps.
        
             
        
        
        
Is this supposed to go along with a book? 
If so can you include the text.
        
             
        
        
        
Answer:
it is either the first or second one. I think it is the first one
 
        
             
        
        
        
He is a monster and is prideful and evil. So he wishes for his pride not to be destroyed