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Sep 12 2010 - 4:30pm
"Devoted Dads" spread from Citizens of the Sea by Nancy Knowlton.
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Dec 22 2010 - 4:21pm
Since the dawn of seafaring, humankind has had to deal with the pesky creatures that settle on ships—seaweeds, barnacles, and others that take advantage of the empty real estate provided by a clean hull. Fouled hulls make for slower speeds and for powerboats, higher fuel costs (drag is a drag).
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Jun 14 2011 - 2:43pm
If youngsters get cared for at all, the mother is usually involved. But in fish and a few other groups where eggs are not abandoned, fathers are the primary care providers. Males are sometimes such devoted dads that it takes longer for them to care for the young than it does for the females to...
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Sep 12 2010 - 3:38pm
"Open Wide" spread from Citizens of the Sea by Nancy Knowlton.
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Sep 12 2010 - 4:42pm
"Hostile Takeovers" spread from Citizens of the Sea by Nancy Knowlton.
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Nov 2 2010 - 12:43pm
Animals, on land and in the ocean, live in a 3-D world, and they depend on their sense organs and brains to build the mental constructs that allow them to orient and navigate, which is crucial for hunting and fleeing. The process is far from simple. Humans, for example, use many visual clues to...
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Nov 19 2012 - 10:49am
Isopods (small, shrimp-like animals) like this one (Gnathia aureusmaculosa) are the mosquitoes of the sea, sucking the blood of fish while they sleep. Find out more in "No Fouling Around" from the Citizens of the Sea blog series.
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Sep 12 2010 - 1:39pm
The cover of Dr. Nancy Knowlton's new book, Citizens of the Sea, published in partnership with the National Geographic Society and the Census of Marine Life. With dazzling photographs and reader-friendly text, the book addresses such topics as the homes, movements, mating, social dynamics, and...
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Jul 12 2010 - 11:25am
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Nov 29 2010 - 6:48pm
All over the world, people have been witnessing gigantic blooms of tens of thousands of jellyfish where once there were only a few. Fishers find them clogging their nets and costing them dearly. In Japan, giant jellyfish capable of reaching six feet across even capsized a boat that tried to bring...
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Dec 14 2012 - 10:15am
A parrotfish (Chlorurus sordidus) creates a mucus cocoon to protect it from parasites, like bloodsucking isopods, while it sleeps. Read more from the Citizens at Sea blog.
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