input: Write a Python function to fetch ocean creatures from Wikipedia using the requests library.
  assert fetch_ocean_creatures("dolphin")['query']['search'][0]['title']=='Dolphin'
  assert fetch_ocean_creatures("whale")['query']['search'][0]['title']=='Whale'
  assert fetch_ocean_creatures("shark")['query']['search'][0]['title']=='Shark'
output: def fetch_ocean_creatures(creature):
      import requests
      
      url = "https://en.wikipedia.org/w/api.php"
      params = {
          'action': 'query',
          'list': 'search',
          'srsearch': creature,
          'format': 'json'
      }
      
      response = requests.get(url, params=params)
      return response.json()