- published: 03 Jun 2017
- views: 9870
Birds (class Aves) are a group of endothermic vertebrates, 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. Birds live worldwide and range in size from the 5 cm (2 in) bee hummingbird to the 2.75 m (9 ft) ostrich. They rank as the class of tetrapods with the most living species, at approximately ten thousand, with more than half of these being passerines, sometimes known as perching birds or, less accurately, as songbirds.
The fossil record indicates that birds are the last surviving dinosaurs, having evolved from feathered ancestors within the theropod group of saurischian dinosaurs. True birds first appeared during the Cretaceous period, around 100 million years ago, and the last common ancestor is estimated to have lived about 95 million years ago. DNA-based evidence finds that birds radiated extensively around the time of the Cretaceous–Paleogene extinction event that killed off the non-avian dinosaurs. Birds in South America survived this event and then migrated to other parts of the world via multiple land bridges while diversifying during periods of global cooling. Primitive bird-like "stem-birds" that lie outside class Aves proper, in the group Avialae, have been found dating back to the mid-Jurassic period. Many of these early stem-birds, such as Archaeopteryx, were not yet capable of fully powered flight, and many retained primitive characteristics like toothy jaws in place of beaks and long bony tails.
The domestic cat (Felis catus or Felis silvestris catus) is a small, typically furry, domesticated, and carnivorous mammal. They are often called house cats when kept as indoor pets or simply cats when there is no need to distinguish them from other felids and felines. Cats are often valued by humans for companionship and for their ability to hunt vermin. There are more than 70 cat breeds; different associations proclaim different numbers according to their standards. The International Progressive Cat Breeders Alliance (IPCBA) recognizes 73 cat breeds while TICA (The International Cat Association) recognizes 58, CFA (The Cat Fanciers' Association) recognizes 44 and Federation International Feline (FIFE) recognizes 43.
Cats are similar in anatomy to the other felids, with a strong, flexible body, quick reflexes, sharp retractable claws, and teeth adapted to killing small prey. Cat senses fit a crepuscular and predatory ecological niche. Cats can hear sounds too faint or too high in frequency for human ears, such as those made by mice and other small animals. They can see in near darkness. Like most other mammals, cats have poorer color vision and a better sense of smell than humans. Cats, despite being solitary hunters, are a social species and cat communication includes the use of a variety of vocalizations (mewing, purring, trilling, hissing, growling, and grunting), as well as cat pheromones and types of cat-specific body language.
Videos for Cats and Dogs to Watch at Home : Birds Spectacular Video Produced by Paul Dinning - Wildlife in Cornwall Filmed in May 2017
This is one of a series of Nature Sounds videos designed for various needs:- as a calming sound to play in the background while studying or as a soothing sound to play while you sleep. These videos can be used for many relaxation requirements and meditation, let me know how you use this video. With each video there will be a tip to help you with your studying or how to achieve a relaxed sleep. Gifts to buy:- Your favourite ‘Nature Scene’ Soundscapes as 8 Hour mp3 downloads. https://gumroad.com/relaxingnaturesounds 1 Hour HD Nature Videos as mp4 downloads. https://gumroad.com/relaxingnaturevideos Natures calming sounds and vision captured for your viewing pleasure. Great classic novels as Audio Book mp3 downloads or as unique sensory videos https://gumroad.com/childrensaudiobooks With...
The Ultimate Videos of Birds for Cats To Watch The birds in the video are - First Clip - Eurasian Jays with a Magpie sneaking in towards the end. 2:15 - Nuthatches, Coal Tits and Blue Tits. 3:19 - Crow, Coal Tit, Nuthatch and Chaffinch. 4:27 - European Goldfinches. 8:14 - Great Tits, Nuthatches, Coal Tits, Robins. 11:47 - Nuthatch, Robin, Blue Tit, Great Tit, Coal Tit. 13:31 - Robins. 15:31 - Female Blackbird, Coal Tit, Great Tit, Blue Tit and Nuthatch. Video Produced by Paul Dinning - Wildlife in Cornwall
19 of the funniest birds you'll see this week. The Pet Collective is home to the top trending clips, most entertaining memes, and funniest animal videos online. Simply put, we think animals are the best ever. If you agree, let’s make it YouTube official right here, right meow: Subscribe to The Pet Collective: http://bit.ly/tpcsub Website: http://www.thepetcollective.tv Facebook: http://www.facebook.com/thepetcollective Instagram: http://www.instagram.com/petcollectivetv Pinterest: http://pinterest.com/petcollectivetv/ Want to submit your own awesome pet vid to us? There's a link for that! jukinmedia.com/video-submissions Watch the Originals: https://www.youtube.com/watch?v=6_-4KArFR08 https://www.youtube.com/watch?v=t1wAjcWHkDY https://www.youtube.com/watch?v=pLJegq01S6A https://www.y...
Entertainment Videos for Cats and Their People to Watch : Birds on The Little Hill - Featuring Chaffinch, Robin, Blue Tit, Great Tit, Coal Tit, Dunnock and Nuthatch Video Produced by Paul Dinning - Wildlife in Cornwall Filmed on May 17th 2017
Birds, they're walking all around
Birds, they're making little sounds
Have you seen any birds today
I will blow those birds away
Birds, birds, birds, birds
Worms, they're sneaking underground
Worms, they're making tiny sounds
Dirt, is what they eat
Rocks and stones make a worm complete
Worms, worms, worms, worms
Birds, they're looking pretty cute
Birds, I see 'em, I shoot
Have you seen any birds today
I will blow those birds away
Birds, birds, birds, birds