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Naturalist Notebook 

October 19, 2011

Spotlight On…

Check out this week’s featured specimen!



(Pictured below, really close up!)



hornsharkeggcase
Photo: Nan Sincero © California Academy of Sciences



Can you guess what it is?



Here are some hints about the animal that this specimen comes from:

  • This animal has a very small range. The furthest it has been known to travel is 10 miles (16.3 km).
  • It is nocturnal.



Leave us a comment with your answer! Then come see us in the Classroom on Sunday, Oct. 23 at 2:30 pm for Science Story Adventures to see if you’re right. Science Story Adventures is our program for children ages 4 – 8 and their caregivers. In the program, we explore the natural world through stories, specimens, games and crafts.


Filed under: Spotlight On... — nature @ 7:00 am

3 Comments »

  1. Is this a type of bat? I’m really not sure. The close-up stumped me pretty good. Haha.

    Comment by Daniel — October 21, 2011 @ 8:40 pm

  2. Is it sea weed or some kind of hydrophyte?

    Comment by Alyssa — October 23, 2011 @ 9:43 am

  3. This week was a hard one! The specimen was actually an egg case from a horn shark (Heterodontus francisci). Different types of sharks have different ways of reproducing. Some sharks are oviparous, meaning they lay eggs. Others are ovoviviparous, meaning the embryos develop inside the female in eggs. They hatch inside the mother and then come out alive. Finally, some are viviparous, meaning they give birth to live young. To learn more about shark reproduction, check out this website:

    For more facts, videos and pictures of horn sharks, check out these websites:

    We’ll have another “Spotlight On” soon, but in the meantime, see if you can tell us who pooped.

    Comment by nature — October 23, 2011 @ 3:28 pm

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