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Birds

Birds (class Aves or clade Avialae) are feathered, winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. With around 10,000 living species, they are the most speciose class of tetrapod vertebrates. All present species belong to the subclass Neornithes, and inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size from the 5 cm (2 in) Bee Hummingbird to the 2.75 m (9 ft) Ostrich. The fossil record indicates that birds emerged within theropod dinosaurs during the Jurassic period, around 150 million years ago. Birds are the only members of the clade originating with the earliest dinosaurs to have survived the Cretaceous–Paleogene extinction event 66 million years ago.

Modern birds are characterised by feathers, a beak with no teeth, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a lightweight but strong skeleton. All living species of birds have wings; the most recent species without wings was the moa, which is generally considered to have become extinct in the 16th century. Wings are evolved forelimbs, and most bird species can fly. Flightless birds include ratites, penguins, and a number of diverse endemic island species. Birds also have unique digestive and respiratory systems that are highly adapted for flight. Some birds, especially corvids and parrots, are among the most intelligent animal species; a number of bird species have been observed manufacturing and using tools, and many social species exhibit cultural transmission of knowledge across generations.

Many species undertake long distance annual migrations, and many more perform shorter irregular movements. Birds are social; they communicate using visual signals and through calls and songs, and participate in social behaviours, including cooperative breeding and hunting, flocking, and mobbing of predators. The vast majority of bird species are socially monogamous, usually for one breeding season at a time, sometimes for years, but rarely for life. Other species have polygynous ("many females") or, rarely, polyandrous ("many males") breeding systems. Eggs are usually laid in a nest and incubated by the parents. Most birds have an extended period of parental care after hatching.

Many species are of economic importance, mostly as sources of food acquired through hunting or farming. Some species, particularly songbirds and parrots, are popular as pets. Other uses include the harvesting of guano (droppings) for use as a fertiliser. Birds figure prominently in all aspects of human culture from religion to poetry to popular music. About 120–130 species have become extinct as a result of human activity since the 17th century, and hundreds more before then. Currently about 1,200 species of birds are threatened with extinction by human activities, though efforts are underway to protect them.

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Idő Cím
06:00:00 06:05:38 Birds-of-Paradise Project Introduction
06:05:38 06:09:00 Explore the World of Birds and Biodiversity
06:09:00 06:12:20 2012: What a Year for the Birds!
06:12:20 06:13:27 Greater Bird-of-Paradise
06:13:27 06:24:00 Birds of the Mississippi River Delta
06:24:00 06:26:59 Thank You for Making Discovery Possible
06:26:59 06:30:29 Birding by Ear: Northern Cardinal Song
06:30:29 06:35:32 Through the Lens: Birds of Australia's Northern Territory
06:35:32 06:39:02 Through the Lens: Acorn Woodpecker
06:39:02 06:45:42 Color: and the Birds-of-Paradise
06:45:42 06:50:50 Inspection & Touch: and the Birds-of-Paradise
06:50:50 07:02:08 Canadian Arctic Expedition
07:02:08 07:04:56 Through the Lens: Black-necked Stilt
07:04:56 07:09:47 Tracking Backyard Birds
07:09:47 07:12:47 Spring Warbler Warm-up Quiz
07:12:47 07:23:27 Inside Birding: Color Pattern
07:23:27 07:29:37 Seabird Success Story
07:29:37 07:35:42 Yula Kapetanakos: Asian Vulture Study
07:35:42 07:39:54 Fast Forward Through a 264-Species Birding Big Day
07:39:54 07:50:42 Talking with a Pale-billed Woodpecker
07:50:42 07:54:21 Snowy Owl Invasion
07:54:21 08:01:23 Two Ruffed Grouse Visit the Ontario FeederWatch Cam
08:01:23 08:08:04 Birding Warblers
08:08:04 08:12:02 How Nature Works: Gull Territoriality
08:12:02 08:17:40 Birds-of-Paradise Project Introduction
08:17:40 08:21:02 Explore the World of Birds and Biodiversity
08:21:02 08:24:22 2012: What a Year for the Birds!
08:24:22 08:25:29 Greater Bird-of-Paradise
08:25:29 08:36:02 Birds of the Mississippi River Delta
08:36:02 08:39:01 Thank You for Making Discovery Possible
08:39:01 08:42:31 Birding by Ear: Northern Cardinal Song
08:42:31 08:47:34 Through the Lens: Birds of Australia's Northern Territory
08:47:34 08:51:04 Through the Lens: Acorn Woodpecker
08:51:04 08:57:44 Color: and the Birds-of-Paradise
08:57:44 09:02:52 Inspection & Touch: and the Birds-of-Paradise
09:02:52 09:14:10 Canadian Arctic Expedition
09:14:10 09:16:58 Through the Lens: Black-necked Stilt
09:16:58 09:21:49 Tracking Backyard Birds
09:21:49 09:24:49 Spring Warbler Warm-up Quiz
09:24:49 09:35:29 Inside Birding: Color Pattern
09:35:29 09:41:39 Seabird Success Story
09:41:39 09:47:44 Yula Kapetanakos: Asian Vulture Study
09:47:44 09:51:56 Fast Forward Through a 264-Species Birding Big Day
09:51:56 10:02:44 Talking with a Pale-billed Woodpecker
10:02:44 10:06:23 Snowy Owl Invasion
10:06:23 10:13:25 Two Ruffed Grouse Visit the Ontario FeederWatch Cam
10:13:25 10:20:06 Birding Warblers
10:20:06 10:24:04 How Nature Works: Gull Territoriality
10:24:04 10:29:42 Birds-of-Paradise Project Introduction
10:29:42 10:33:04 Explore the World of Birds and Biodiversity
10:33:04 10:36:24 2012: What a Year for the Birds!
10:36:24 10:37:31 Greater Bird-of-Paradise
10:37:31 10:48:04 Birds of the Mississippi River Delta
10:48:04 10:51:03 Thank You for Making Discovery Possible
10:51:03 10:54:33 Birding by Ear: Northern Cardinal Song
10:54:33 10:59:36 Through the Lens: Birds of Australia's Northern Territory
10:59:36 11:03:06 Through the Lens: Acorn Woodpecker
11:03:06 11:09:46 Color: and the Birds-of-Paradise
11:09:46 11:14:54 Inspection & Touch: and the Birds-of-Paradise
11:14:54 11:26:12 Canadian Arctic Expedition
11:26:12 11:29:00 Through the Lens: Black-necked Stilt
11:29:00 11:33:51 Tracking Backyard Birds
11:33:51 11:36:51 Spring Warbler Warm-up Quiz
11:36:51 11:47:31 Inside Birding: Color Pattern
11:47:31 11:53:41 Seabird Success Story
11:53:41 11:59:46 Yula Kapetanakos: Asian Vulture Study
11:59:46 12:03:58 Fast Forward Through a 264-Species Birding Big Day
12:03:58 12:14:46 Talking with a Pale-billed Woodpecker
12:14:46 12:18:25 Snowy Owl Invasion
12:18:25 12:25:27 Two Ruffed Grouse Visit the Ontario FeederWatch Cam
12:25:27 12:32:08 Birding Warblers
12:32:08 12:36:06 How Nature Works: Gull Territoriality
12:36:06 12:41:44 Birds-of-Paradise Project Introduction
12:41:44 12:45:06 Explore the World of Birds and Biodiversity
12:45:06 12:48:26 2012: What a Year for the Birds!
12:48:26 12:49:33 Greater Bird-of-Paradise
12:49:33 13:00:06 Birds of the Mississippi River Delta
13:00:06 13:03:05 Thank You for Making Discovery Possible
13:03:05 13:06:35 Birding by Ear: Northern Cardinal Song
13:06:35 13:11:38 Through the Lens: Birds of Australia's Northern Territory
13:11:38 13:15:08 Through the Lens: Acorn Woodpecker
13:15:08 13:21:48 Color: and the Birds-of-Paradise
13:21:48 13:26:56 Inspection & Touch: and the Birds-of-Paradise
13:26:56 13:38:14 Canadian Arctic Expedition
13:38:14 13:41:02 Through the Lens: Black-necked Stilt
13:41:02 13:45:53 Tracking Backyard Birds
13:45:53 13:48:53 Spring Warbler Warm-up Quiz
13:48:53 13:59:33 Inside Birding: Color Pattern
13:59:33 14:05:43 Seabird Success Story
14:05:43 14:11:48 Yula Kapetanakos: Asian Vulture Study
14:11:48 14:16:00 Fast Forward Through a 264-Species Birding Big Day
14:16:00 14:26:48 Talking with a Pale-billed Woodpecker
14:26:48 14:30:27 Snowy Owl Invasion
14:30:27 14:37:29 Two Ruffed Grouse Visit the Ontario FeederWatch Cam
14:37:29 14:44:10 Birding Warblers
14:44:10 14:48:08 How Nature Works: Gull Territoriality
14:48:08 14:53:46 Birds-of-Paradise Project Introduction
14:53:46 14:57:08 Explore the World of Birds and Biodiversity
14:57:08 15:00:28 2012: What a Year for the Birds!
15:00:28 15:01:35 Greater Bird-of-Paradise
15:01:35 15:12:08 Birds of the Mississippi River Delta
15:12:08 15:15:07 Thank You for Making Discovery Possible
15:15:07 15:18:37 Birding by Ear: Northern Cardinal Song
15:18:37 15:23:40 Through the Lens: Birds of Australia's Northern Territory
15:23:40 15:27:10 Through the Lens: Acorn Woodpecker
15:27:10 15:33:50 Color: and the Birds-of-Paradise
15:33:50 15:38:58 Inspection & Touch: and the Birds-of-Paradise
15:38:58 15:50:16 Canadian Arctic Expedition
15:50:16 15:53:04 Through the Lens: Black-necked Stilt
15:53:04 15:57:55 Tracking Backyard Birds
15:57:55 16:00:55 Spring Warbler Warm-up Quiz
16:00:55 16:11:35 Inside Birding: Color Pattern
16:11:35 16:17:45 Seabird Success Story
16:17:45 16:23:50 Yula Kapetanakos: Asian Vulture Study
16:23:50 16:28:02 Fast Forward Through a 264-Species Birding Big Day
16:28:02 16:38:50 Talking with a Pale-billed Woodpecker
16:38:50 16:42:29 Snowy Owl Invasion
16:42:29 16:49:31 Two Ruffed Grouse Visit the Ontario FeederWatch Cam
16:49:31 16:56:12 Birding Warblers
16:56:12 17:00:10 How Nature Works: Gull Territoriality
17:00:10 17:05:48 Birds-of-Paradise Project Introduction
17:05:48 17:09:10 Explore the World of Birds and Biodiversity
17:09:10 17:12:30 2012: What a Year for the Birds!
17:12:30 17:13:37 Greater Bird-of-Paradise
17:13:37 17:24:10 Birds of the Mississippi River Delta
17:24:10 17:27:09 Thank You for Making Discovery Possible
17:27:09 17:30:39 Birding by Ear: Northern Cardinal Song
17:30:39 17:35:42 Through the Lens: Birds of Australia's Northern Territory
17:35:42 17:39:12 Through the Lens: Acorn Woodpecker
17:39:12 17:45:52 Color: and the Birds-of-Paradise
17:45:52 17:51:00 Inspection & Touch: and the Birds-of-Paradise
17:51:00 18:02:18 Canadian Arctic Expedition
18:02:18 18:05:06 Through the Lens: Black-necked Stilt
18:05:06 18:09:57 Tracking Backyard Birds
18:09:57 18:12:57 Spring Warbler Warm-up Quiz
18:12:57 18:23:37 Inside Birding: Color Pattern
18:23:37 18:29:47 Seabird Success Story
18:29:47 18:35:52 Yula Kapetanakos: Asian Vulture Study
18:35:52 18:40:04 Fast Forward Through a 264-Species Birding Big Day
18:40:04 18:50:52 Talking with a Pale-billed Woodpecker
18:50:52 18:54:31 Snowy Owl Invasion
18:54:31 19:01:33 Two Ruffed Grouse Visit the Ontario FeederWatch Cam
19:01:33 19:08:14 Birding Warblers
19:08:14 19:12:12 How Nature Works: Gull Territoriality
19:12:12 19:17:50 Birds-of-Paradise Project Introduction
19:17:50 19:21:12 Explore the World of Birds and Biodiversity
19:21:12 19:24:32 2012: What a Year for the Birds!
19:24:32 19:25:39 Greater Bird-of-Paradise
19:25:39 19:36:12 Birds of the Mississippi River Delta
19:36:12 19:39:11 Thank You for Making Discovery Possible
19:39:11 19:42:41 Birding by Ear: Northern Cardinal Song
19:42:41 19:47:44 Through the Lens: Birds of Australia's Northern Territory
19:47:44 19:51:14 Through the Lens: Acorn Woodpecker
19:51:14 19:57:54 Color: and the Birds-of-Paradise
19:57:54 20:03:02 Inspection & Touch: and the Birds-of-Paradise
20:03:02 20:14:20 Canadian Arctic Expedition
20:14:20 20:17:08 Through the Lens: Black-necked Stilt
20:17:08 20:21:59 Tracking Backyard Birds
20:21:59 20:24:59 Spring Warbler Warm-up Quiz
20:24:59 20:35:39 Inside Birding: Color Pattern
20:35:39 20:41:49 Seabird Success Story
20:41:49 20:47:54 Yula Kapetanakos: Asian Vulture Study
20:47:54 20:52:06 Fast Forward Through a 264-Species Birding Big Day
20:52:06 21:02:54 Talking with a Pale-billed Woodpecker
21:02:54 21:06:33 Snowy Owl Invasion
21:06:33 21:13:35 Two Ruffed Grouse Visit the Ontario FeederWatch Cam
21:13:35 21:20:16 Birding Warblers
21:20:16 21:24:14 How Nature Works: Gull Territoriality
21:24:14 21:29:52 Birds-of-Paradise Project Introduction
21:29:52 21:33:14 Explore the World of Birds and Biodiversity
21:33:14 21:36:34 2012: What a Year for the Birds!
21:36:34 21:37:41 Greater Bird-of-Paradise
21:37:41 21:48:14 Birds of the Mississippi River Delta
21:48:14 21:51:13 Thank You for Making Discovery Possible
21:51:13 21:54:43 Birding by Ear: Northern Cardinal Song
21:54:43 21:59:46 Through the Lens: Birds of Australia's Northern Territory
21:59:46 22:03:16 Through the Lens: Acorn Woodpecker
22:03:16 22:09:56 Color: and the Birds-of-Paradise
22:09:56 22:15:04 Inspection & Touch: and the Birds-of-Paradise
22:15:04 22:26:22 Canadian Arctic Expedition
22:26:22 22:29:10 Through the Lens: Black-necked Stilt
22:29:10 22:34:01 Tracking Backyard Birds
22:34:01 22:37:01 Spring Warbler Warm-up Quiz
22:37:01 22:47:41 Inside Birding: Color Pattern
22:47:41 22:53:51 Seabird Success Story
22:53:51 22:59:56 Yula Kapetanakos: Asian Vulture Study
22:59:56 23:04:08 Fast Forward Through a 264-Species Birding Big Day
23:04:08 23:14:56 Talking with a Pale-billed Woodpecker
23:14:56 23:18:35 Snowy Owl Invasion
23:18:35 23:25:37 Two Ruffed Grouse Visit the Ontario FeederWatch Cam
23:25:37 23:32:18 Birding Warblers
23:32:18 23:36:16 How Nature Works: Gull Territoriality
23:36:16 23:41:54 Birds-of-Paradise Project Introduction
23:41:54 23:45:16 Explore the World of Birds and Biodiversity
23:45:16 23:48:36 2012: What a Year for the Birds!
23:48:36 23:49:43 Greater Bird-of-Paradise
23:49:43 00:00:16 Birds of the Mississippi River Delta
00:00:16 00:03:15 Thank You for Making Discovery Possible
00:03:15 00:06:45 Birding by Ear: Northern Cardinal Song
00:06:45 00:11:48 Through the Lens: Birds of Australia's Northern Territory
00:11:48 00:15:18 Through the Lens: Acorn Woodpecker
00:15:18 00:21:58 Color: and the Birds-of-Paradise
00:21:58 00:27:06 Inspection & Touch: and the Birds-of-Paradise
00:27:06 00:38:24 Canadian Arctic Expedition
00:38:24 00:41:12 Through the Lens: Black-necked Stilt
00:41:12 00:46:03 Tracking Backyard Birds
00:46:03 00:49:03 Spring Warbler Warm-up Quiz
00:49:03 00:59:43 Inside Birding: Color Pattern
00:59:43 01:05:53 Seabird Success Story
01:05:53 01:11:58 Yula Kapetanakos: Asian Vulture Study
01:11:58 01:16:10 Fast Forward Through a 264-Species Birding Big Day
01:16:10 01:26:58 Talking with a Pale-billed Woodpecker
01:26:58 01:30:37 Snowy Owl Invasion
01:30:37 01:37:39 Two Ruffed Grouse Visit the Ontario FeederWatch Cam
01:37:39 01:44:20 Birding Warblers
01:44:20 01:48:18 How Nature Works: Gull Territoriality
01:48:18 01:53:56 Birds-of-Paradise Project Introduction
01:53:56 01:57:18 Explore the World of Birds and Biodiversity
01:57:18 02:00:38 2012: What a Year for the Birds!
02:00:38 02:01:45 Greater Bird-of-Paradise
02:01:45 02:12:18 Birds of the Mississippi River Delta
02:12:18 02:15:17 Thank You for Making Discovery Possible
02:15:17 02:18:47 Birding by Ear: Northern Cardinal Song
02:18:47 02:23:50 Through the Lens: Birds of Australia's Northern Territory
02:23:50 02:27:20 Through the Lens: Acorn Woodpecker
02:27:20 02:34:00 Color: and the Birds-of-Paradise
02:34:00 02:39:08 Inspection & Touch: and the Birds-of-Paradise
02:39:08 02:50:26 Canadian Arctic Expedition
02:50:26 02:53:14 Through the Lens: Black-necked Stilt
02:53:14 02:58:05 Tracking Backyard Birds
02:58:05 03:01:05 Spring Warbler Warm-up Quiz
03:01:05 03:11:45 Inside Birding: Color Pattern
03:11:45 03:17:55 Seabird Success Story
03:17:55 03:24:00 Yula Kapetanakos: Asian Vulture Study
03:24:00 03:28:12 Fast Forward Through a 264-Species Birding Big Day
03:28:12 03:39:00 Talking with a Pale-billed Woodpecker
03:39:00 03:42:39 Snowy Owl Invasion
03:42:39 03:49:41 Two Ruffed Grouse Visit the Ontario FeederWatch Cam
03:49:41 03:56:22 Birding Warblers
03:56:22 04:00:20 How Nature Works: Gull Territoriality
04:00:20 04:05:58 Birds-of-Paradise Project Introduction
04:05:58 04:09:20 Explore the World of Birds and Biodiversity
04:09:20 04:12:40 2012: What a Year for the Birds!
04:12:40 04:13:47 Greater Bird-of-Paradise
04:13:47 04:24:20 Birds of the Mississippi River Delta
04:24:20 04:27:19 Thank You for Making Discovery Possible
04:27:19 04:30:49 Birding by Ear: Northern Cardinal Song
04:30:49 04:35:52 Through the Lens: Birds of Australia's Northern Territory
04:35:52 04:39:22 Through the Lens: Acorn Woodpecker
04:39:22 04:46:02 Color: and the Birds-of-Paradise
04:46:02 04:51:10 Inspection & Touch: and the Birds-of-Paradise
04:51:10 05:02:28 Canadian Arctic Expedition
05:02:28 05:05:16 Through the Lens: Black-necked Stilt
05:05:16 05:10:07 Tracking Backyard Birds
05:10:07 05:13:07 Spring Warbler Warm-up Quiz
05:13:07 05:23:47 Inside Birding: Color Pattern
05:23:47 05:29:57 Seabird Success Story
05:29:57 05:36:02 Yula Kapetanakos: Asian Vulture Study
05:36:02 05:40:14 Fast Forward Through a 264-Species Birding Big Day
05:40:14 05:51:02 Talking with a Pale-billed Woodpecker
05:51:02 05:54:41 Snowy Owl Invasion
05:54:41 06:01:43 Two Ruffed Grouse Visit the Ontario FeederWatch Cam