diff --git a/youtube_dl/extractor/__init__.py b/youtube_dl/extractor/__init__.py
index 732229c14c..bae151e58c 100644
--- a/youtube_dl/extractor/__init__.py
+++ b/youtube_dl/extractor/__init__.py
@@ -19,7 +19,6 @@
 from .airmozilla import AirMozillaIE
 from .aljazeera import AlJazeeraIE
 from .alphaporno import AlphaPornoIE
-from .animalplanet import AnimalPlanetIE
 from .anitube import AnitubeIE
 from .anysex import AnySexIE
 from .aol import AolIE
diff --git a/youtube_dl/extractor/animalplanet.py b/youtube_dl/extractor/animalplanet.py
deleted file mode 100644
index 0cebc81855..0000000000
--- a/youtube_dl/extractor/animalplanet.py
+++ /dev/null
@@ -1,53 +0,0 @@
-# coding: utf-8
-from __future__ import unicode_literals
-
-from .common import InfoExtractor
-from ..compat import compat_str
-from ..utils import (
-    parse_duration,
-    parse_iso8601,
-)
-
-
-class AnimalPlanetIE(InfoExtractor):
-    _VALID_URL = r'https?://(?:www\.)?animalplanet\.com/([^/]+/)*(?P<id>[^/\?#]+)'
-    _TESTS = [{
-        'url': 'http://www.animalplanet.com/tv-shows/i-shouldnt-be-alive/videos/dog-saves-injured-owner/',
-        'info_dict': {
-            'id': '10608',
-            'ext': 'mp4',
-            'title': 'Dog Saves Injured Owner',
-            'description': 'A world class athlete is put to the test when she falls into a canyon and breaks her hip. Her only companion is her dog, Taz, who is on a mission to save her!',
-            'upload_date': '20100410',
-            'timestamp': 1270857727,
-            'duration': 220,
-        },
-        'params': {
-            # m3u8 download
-            'skip_download': True,
-        }
-    }, {
-        'url': 'http://www.animalplanet.com/longfin-eels-maneaters/',
-        'only_matching': True,
-    }]
-
-    def _real_extract(self, url):
-        display_id = self._match_id(url)
-        webpage = self._download_webpage(url, display_id)
-
-        video_data = self._parse_json(self._search_regex(
-            r'initialVideoData\s*=\s*({.+?});',
-            webpage, 'initialVideoData'), display_id)['playlist'][0]
-
-        return {
-            'id': compat_str(video_data['id']),
-            'display_id': display_id,
-            'title': video_data['title'],
-            'description': video_data.get('description'),
-            'thumbnail': video_data.get('thumbnailURL'),
-            'duration': parse_duration(video_data.get('video_length')),
-            'timestamp': parse_iso8601(video_data.get('publishedDate')),
-            'formats': self._extract_m3u8_formats(
-                video_data['src'], display_id, 'mp4',
-                'm3u8_native', m3u8_id='hls')
-        }
diff --git a/youtube_dl/extractor/discovery.py b/youtube_dl/extractor/discovery.py
index 507f4bdad9..2626d85e3a 100644
--- a/youtube_dl/extractor/discovery.py
+++ b/youtube_dl/extractor/discovery.py
@@ -9,7 +9,17 @@
 
 
 class DiscoveryIE(InfoExtractor):
-    _VALID_URL = r'https?://www\.discovery\.com\/[a-zA-Z0-9\-]*/[a-zA-Z0-9\-]*/videos/(?P<id>[a-zA-Z0-9_\-]*)(?:\.htm)?'
+    _VALID_URL = r'''(?x)http://(?:www\.)?(?:
+            discovery|
+            investigationdiscovery|
+            discoverylife|
+            animalplanet|
+            ahctv|
+            destinationamerica|
+            sciencechannel|
+            tlc|
+            velocity
+        )\.com/([^/]+/)*(?P<id>[^\./\?#]+)'''
     _TESTS = [{
         'url': 'http://www.discovery.com/tv-shows/mythbusters/videos/mission-impossible-outtakes.htm',
         'info_dict': {
@@ -21,8 +31,8 @@ class DiscoveryIE(InfoExtractor):
                             'don\'t miss Adam moon-walking as Jamie ... behind Jamie\'s'
                             ' back.'),
             'duration': 156,
-            'timestamp': 1303099200,
-            'upload_date': '20110418',
+            'timestamp': 1302032462,
+            'upload_date': '20110405',
         },
         'params': {
             'skip_download': True,  # requires ffmpeg
@@ -33,27 +43,38 @@ class DiscoveryIE(InfoExtractor):
             'id': 'mythbusters-the-simpsons',
             'title': 'MythBusters: The Simpsons',
         },
-        'playlist_count': 9,
+        'playlist_mincount': 10,
+    }, {
+        'url': 'http://www.animalplanet.com/longfin-eels-maneaters/',
+        'info_dict': {
+            'id': '78326',
+            'ext': 'mp4',
+            'title': 'Longfin Eels: Maneaters?',
+            'description': 'Jeremy Wade tests whether or not New Zealand\'s longfin eels are man-eaters by covering himself in fish guts and getting in the water with them.',
+            'upload_date': '20140725',
+            'timestamp': 1406246400,
+            'duration': 116,
+        },
     }]
 
     def _real_extract(self, url):
-        video_id = self._match_id(url)
-        info = self._download_json(url + '?flat=1', video_id)
+        display_id = self._match_id(url)
+        info = self._download_json(url + '?flat=1', display_id)
 
         video_title = info.get('playlist_title') or info.get('video_title')
 
         entries = [{
             'id': compat_str(video_info['id']),
             'formats': self._extract_m3u8_formats(
-                video_info['src'], video_id, ext='mp4',
+                video_info['src'], display_id, 'mp4', 'm3u8_native', m3u8_id='hls',
                 note='Download m3u8 information for video %d' % (idx + 1)),
             'title': video_info['title'],
             'description': video_info.get('description'),
             'duration': parse_duration(video_info.get('video_length')),
-            'webpage_url': video_info.get('href'),
+            'webpage_url': video_info.get('href') or video_info.get('url'),
             'thumbnail': video_info.get('thumbnailURL'),
             'alt_title': video_info.get('secondary_title'),
             'timestamp': parse_iso8601(video_info.get('publishedDate')),
         } for idx, video_info in enumerate(info['playlist'])]
 
-        return self.playlist_result(entries, video_id, video_title)
+        return self.playlist_result(entries, display_id, video_title)