HOW DIVE BIRDS WITHOUT BREAKING THE NECK

The brown pelican, cormorants, loons, gannets or the loons. 
These are some of the birds that can exceed 80 km / h when diving into the water to search for prey. According to the jumpers circuit Red Bull, which reach similar speeds to jump from almost 30 meters, if the input is clean hardly feel the impact (they have a water jet that breaks the surface tension and lessens the blow considerably) but if the input is bad, "it is like Mike Tyson gave you full".
  
 

But birds do normally always head and despite the thinness of his neck. "We were interested to see what happens when objects are immersed in water - explains Sunny Jung, one of the authors of the study published in Proceedings of the National Academy of Sciences of the United States of America -., So we looked for examples in nature In this regard, gannets are amazing. "Jung is an expert in the field of fluid mechanics and has published so ... striking a study on the system using dogs to drink, another on how to float flowers and even one called dynamic fluid under pressure: clap your hands are wet.

Jung's team focused on investigating the biomechanics of gannets diving and discovered that both the shape of the head, neck, as the length of the muscles work together to ensure that the impact with the water does not cause damage.

To analyze the accurately as possible, they used a booby rescued by the Museum of Natural Sciences North Carolina and counted 3D replicas of the skulls provided by the Smithsonian Institute. The results showed that the main force acting on the head of alcatraz, is friction, but the geometry of the head, neck length and shape of the peak, reduces this friction when compared to other birds "says Jung.

http://www.quo.es/ciencia/como-se-zambullen-las-aves-sin-romperse-el-cuello

Glossary: 

-The brown pelican: It is a subspecies of brown pelican (Pelecanus occidentalis), a bird belonging to the family of pelicans (Pelecanidae) inhabiting, with several subspecies, in the coasts of America from southern United States to Brazil. This subspecies is found on the islands and coasts of tropical America that bathes the Pacific Ocean.

Cormorant: is a family of some 40 species of aquatic birds commonly known as cormorants and shags. Several different classifications of the family have been proposed recently, and the number of genera is disputed. There is no consistent distinction between "cormorants" and "shags" as these appellations have been assigned to different species randomly.

Analysis:

In my opinion this new it's so interesting because these type of birds do things that the humans or other type of bird can't do. 
They do this because they are searching from prey so it's so important doing these things to supervive.