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penguins.neaq.org/2010/12/faq-do-penguins-have-ears.html

The absence of external ear flaps gives the penguins a more streamline shape and minimizes drag as they swim through the water. No external ear flaps reduce drag as the penguins zoom through the water. Even though you cannot see their ears doesn't mean they do not hear well. Penguins have very specialized hearing above and below the water.

www.reference.com/pets-animals/penguins-communicate-9557cf78c11257b0

How Do Penguins Communicate? Penguins primarily communicate vocally, but they also communicate through body language and posturing. Penguins all look virtually identical, which makes individual recognition very difficult.

www.answers.com/Q/How_do_penguins_hear

Answers.com is the place to go to get the answers you need and to ask the questions you want

penguinsblog.com/do-penguins-have-ears

Is it possible for the Penguins to hear easily? It is true that we can’t see the ears of the penguins with our eyes, but it does not mean that the penguins cannot hear all types of sounds. One of the fantastic things about the penguins is that they have a very exceptional power of hearing the sounds below and above the water.

www.answers.com/Q/Do_penguins_have_ears

Do penguins have ears? Yes, penguin ears are in the same place as ours. The only difference is that they have no external ear and that the opening is covered by feathers. ... Penguins can hear ...

www.umweltbundesamt.de/en/press/pressinformation/how-well-do-penguins-hear

A good deal of research has been done on penguins, for example on their foraging habits or migration patterns. But there has been only one study to date on whether and how good penguins hear – which is surprising because noise is just as much a problem for marine animals as marine litter, only far less known.

www.penguins-world.com/do-penguins-have-ears

Answer: Penguins do not have external ears, but they have a sharp hearing sense, while is not as developed as in other marine animals, it has the capability to recognize the broad range of vocalizations performed by penguins to communicate.

defenders.org/penguins/basic-facts

Basic Facts About Penguins. Penguins are aquatic, flightless birds that are highly adapted to life in the water. Their distinct tuxedo-like appearance is called countershading, a form of camouflage that helps keep them safe in the water. Penguins do have wing-bones, though they are flipper-like and extremely suited to swimming.

archives.nbclearn.com/portal/site/k-12/flatview?cuecard=40142

Researchers study how penguins recognize the individual calls of other penguins -- their mates, their babies -- amongst the calls of 1,000 other penguins in a colony. (Its all in the tune, tone and timing.)

www.atozkidsstuff.com/penguins.html

Most prey of penguins inhabit the upper water layers so most penguins do not have to dive to great depths. Penguins hunt food that clumps together in a group. It is very efficient for a penguin to dive and grab several prey than to dive and grab one prey at a time. Penguins eat three types of food: krill, fish, and squid.