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National Wildlife Humane Society |
| Wildlife Conservation News |
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| Member News |
| Mosquito Music |
| Sea Lion Mystery |
| Blue Whale Songs |
National Wildlife Humane Society
A non-profit wildlife conservation organization working to preserve and protect threatened and endangered species.
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Famous San Francisco Sea Lions Abandon Pier 39
Source: Wired Science By: Alexis Madrigal
“We have no idea where they moved on to or why,” said Shelbi Stoudt, who manages a team that helps stranded animals in the San Francisco Bay from the Marine Mammal Center in Sausalito, California.
The sea lions’ disappearance is as strange as their initial colonization of the pier about 20 years ago, in late 1989. They just started showing up one day and as their numbers increased, their traditional hang out, Seal Rocks, became less populated. There are all sorts of theories about why the pier became a favorite haul-out spot for the sea lions, but no one knows for sure why the animals’ behavior changed......
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Blue Whales’ Lower-Pitch Songs Signal Population Increase
Source: The Epoch Times By: Helena Zhu
The pitch of blue whale songs around the world has been lowering for the past few decades, and scientists think that it may indicate an increase in the population of this endangered animal, which was commercially hunted until 1972.
Studying blue whale song data from the Southern California coast to the Indian and Southern Oceans, Mark McDonald of WhaleAcoustics, John Hildebrand of Scripps Oceanography, and Sarah Mesnick of NOAA Fisheries Southwest Fisheries Science Center discovered a downward curve in the pitch, or frequency, of the songs.
“The best documented song type, observed offshore California, now is sung at a frequency 31 percent lower than it was in the 1960s,” they wrote in their research paper. “Worldwide Decline in Tonal Frequencies of Blue Whale Songs,” published in the journal Endangered Species Research....
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