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Anhingas: Bad Floaters, Great Sinkers

[fa icon="calendar"] Feb 2, 2018 8:00:00 PM / by Kurt Holle

Kurt Holle

Anhingas are waterbirds with no buoyancy. In other words, they are bad floaters. Think of yourself, arms open, staring at the sky, floating in the ocean. You tend to sink. Much like an anhinga.

Anhingas feathers are not water tight. The tiny spaces between feathers and skin get waterlogged. That makes them heavier in water. That is why anhingas float with their whole body submerged. This is not great when floating.

Firstly, it cools your body temperature quickly. It also takes more energy to keep afloat.

Finally, it makes it harder to take off from water.

Why would a water bird want this anatomy?

 

anhinga-1.jpg

Here is why...

  • Bad floaters are good sinkers. Good sinking is great when diving. That is true whether you come in from the air or from water. So anhingas consume less energy below water than other watertight birds.
  • They can also dive deeper. This expands their fishing range. They can get to fish other birds can´t.
  • Waterlogged feathers, however, also mean tightened their range around the tropics. They need lots of sun to dry off cold water. They also need to avoid freezing temperatures.

As always the link to the paper.

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Topics: birds, Flora and Fauna

Kurt Holle

Written by Kurt Holle

Kurt has been hanging out in tropical rainforests since he was eight and lived in Costa Rica. His first trip to Madre de Dios was in 1988 when he was twenty. Kurt immediately knew he was in a special place: he saw five different species of monkeys in the hike between the boat and his camp. He became a partner in Rainforest Expeditions in 1992 because it seemed like a fun way to make a living. And he was right! Nowadays he’s mostly a passive business partner. In 2016, Kurt was a proud member of the team that designed, implemented and launched the Wired Amazon.

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