Yes, the sentence is correct. To purge is to get rid of. Please note that "vocabulary" in the sentence that you use it is always uncountable.

In computer term purge means to remove something for good. If you delete something it will be on your storage with a mark 'deleted'. If you purge it, the data will be removed from your storage. So purge means to completely delete/remove something.

Here is the full Oxford Dictionary definition if we wish to delve into the different meanings: [WITH OBJECT] 1Rid (someone) of an unwanted feeling, memory, or condition:Bob had helped purge Martha of theterrible guilt that had haunted her 1.1Free someone from (an unwanted feeling, memory, etc.):his hatred was purged 1.2Remove (a group of people consideredundesirable) from an organization or place in an abrupt or violent way:he purged all but 26 of the central committee members 1.3Remove a group of undesirable people from (an organization or place) in anabrupt or violent way:an opportunity to purge the party of unsatisfactory members 1.4Law Atone for or wipe out (contempt ofcourt):he has a right to apply to the court to purge his contempt 2Physically remove (something) completely:a substance designed to purge impurities from the body 2.1[NO OBJECT] Evacuate one’s bowels, especially as a result of taking a laxative:sufferers eat normally in summer but overeat and purge during winter; (as noun purging) occasional bingesare followed by self-induced purging or vomiting

It is not an emphasis. Luca is right. It is a matter of meaning. The writer or speaker of the sentence thinks that wildlife is a hindrance or an undesirable thing. It would be the dialogue of, for example, ruthless developers who would rather see suburban houses than wildlife.

Wow. I think you understood exactly what i was wondering. So in this case, the writer used word 'purge' to emphasize the meaning instead of using 'get rid of' or something. Am i right?