Chiidax the Northern Fur Seal and the Evolution of the Otariids

Late last year, the New England Aquarium in Boston, Massachusetts received Chiidax, an orphaned northern fur seal (Callorhinus ursinus).  However, it was last July that Alaska SeaLife Center first took in Chiidax, after he was left outside the Alaska Department of Fish and Game offices.  A note which was included on the outside of the box that the pup came in said that the pup's mother had died while she was giving birth.  Notice how in the first two pictures of Chiidax below, the pup is covered in an all black coat, a mark of his young age.

After the pups are weaned at around four months old, they molt into their next coat, the cream and brown color of the young juvenile northern fur seal.  Look for those in these next four pictures, taken sometime last fall.  The post on ZooBorns (read that HERE) doesn't say exactly when the pictures were taken, but given that the post was published late last November, these last photos were presumably taken around then.  

When the first post on Chiidax was written on November 23rd of 2013, he weighed 18 pounds, but when he's full grown, he will definitely be a bit bigger: the males, or bulls, of the species can weigh nearly 600 pounds, which is several times more than the females weigh!  The males have to be so large because they create harems of thirty to forty females, and defend them from other males.  The seals are native to the Pacific Coast of the United States, as well as the coast of the Bering Sea in Canada, Alaska, and Russia.  

The last report on Chiidax was in late December, on the 29th.  Below are several pictures that were shared then.  You can see how smooth he looks, and how perfectly adapted for a life beneath the waves this creature is!  

The northern fur seal is the sole extant member of the genus Callorhinus, but there is also a fossil species of Callorhinus.  C. gilmorei is known from the Pliocene Epoch of southern California and Mexico, as you can see in this paper HERE.  Other sources cite another paper, linked HERE, as stating that this genus is also known from Japan, but I was unwilling to pay the fee to read the paper, so that fact remains unconfirmed.  If you have a subscription to this online journal, let me know what you find!

According to the first paper, the eared seals, or the members of the family Otariidae, can be traced back at least to the Mid to Late Miocene Epoch, approximately 11-12 MYA in California, in the form of Pithanotaria starri.  Another taxon, Thalassoleon mexicanus, is known from Mexico during the Late Miocene, approximately 5-8 MYA.  The authors of the paper suggest that between 5 MYA and today, between our time and the time of Thalassoleon, was when fur seal diversification took off, resulting in the eight extant species of Arctocephalus and the extant Callorhinus ursinus, which includes little Chiidax!  The genus Arctocephalus, along with the genus Callorhinus, comprise the extant members of the eared fur seals.  The writers of the paper also suspect that it is during this 5 million year period that the sea lions developed as well.

Things have probably changed a lot in this area of paleontology since this paper was published in 1986, but unfortunately I can't seem to access most of these papers.  Callorhinus gilmorei still seems to be a valid taxon, however, as do Thalassoleon and Pithanotaria.  Hopefully, new fossils will yield more interesting results regarding these creatures very soon!  

Unless otherwise noted, the photo credit for all of these pictures in the post go to ZooBorns, either this post HERE or HERE.  

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Works Cited:

Sanctuary Spotlight: The Marine Mammal Center

While in San Francisco, my family and I decided to check out the nearby Marine Mammal Center, and boy are we glad we did!  It was a really, really cool place, and we got to learn all about the local marine mammals, as well as what is being done to conserve and preserve them!  In the picture below, you can see my sister standing next to a life-size statue of an elephant seal!

We also got to see all of the enclosures where the various seals and sea lions are kept while they are being rehabilitated.

 

 

We also got to watch (and, in the case of my sister, be a part of!) a really cool and interesting demonstration about how the people who work at the Marine Mammal Center are able to capture wounded and injured seals and sea lions, and bring them in to the center for care!  

 

 

 

 

 

 

 

 

 

Photo credit for all of the photos in this post goes to Julie Neher.

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Seals and Sea Otters in Monterey Bay

Right after my family and I visited the Monterey Bay Aquarium in California, we went out to eat at a Bubba Gump on the dock.  As we looked out at the bay, we saw a seal pop its head up out of the water!  We took a bunch of pictures, but it wasn't long before it disappeared beneath the waves again.  After looking at the pictures, I came to the conclusion that it was not, in fact, a seal, but actually a sea otter!  My bad.

The seal that's not really a seal but actually a sea otter

After a few more minutes, one of us suddenly realized that not all of the lumps of floating kelp out there were actually kelp: some of them were actually wild sea otters!  It was really, really cool!  Being a native Coloradoan, a sea otter is pretty exotic, especially a wild one!  Here are a bunch of pictures that my mother and I took!

A wild sea otter!

The sea otters are off to the right, not the thing right in the center of the photo, that is a kelp thing

The sea otter is a little below and to the left of center

The group of three little dots in the middle-ish of the photo, as well as the little dot thing off to the right of the picture (almost out of the shot) are all sea otters.  The other random dot, to the left of the three other dots, is the same lump of kelp that is in the photo two above this one.

The sea otter-looking dot in the a bit above the center of the photo is the sea otter

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The Seals of San Diego

When we went to San Diego to visit our cousins, we also went to a place nearby in Solana Beach to see some seals!  The seals were all just kind of hanging out, and we could look down on them from above.  A lot of them were really, really cute, and some of them were even swimming around!  Most of them were just chilling on the sand, warming themselves up on the beach!  I don't think a human could EVER get that relaxed!  Enjoy these pictures taken by my mother!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  

Photo Credit for all of the photos in this post goes to Julie Neher.

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Elephants Seals Near Hearst Castle

Nearby Hearst Castle, there's a beach.  You can't swim on it, though.  Not unless you weigh 2 or more tons and you are a pinniped, at least.  The whole beach is reserved for elephant seals!  If you are ever out near Hearst Castle, you definitely want to check it out!  Here are a bunch of really super cool photos that my mother took of them!

 

 

 

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