Answered by DanielCosta

Question from Prasad Siripuram:

On TV we see the great white shark attack unsuspecting sea lions from below. If the sea lion pares off the initial attack, it generally outmaneuvers the shark. An elephant seal, on the other hand, doesn't have the swimming agility of a sea lion or a great bite power to thwart off a great white shark. Going by this logic, a great white can pick off an elephant seal anywhere at the depth or at the surface and the poor seal doesn't seem to have a chance.

Answered by GeorgeShillinger

Question from Inam Abidi:

The tags must contain some sort of electronics to store information. Does the tags left in the water affect the ocean in any way once the animal dies? If they don't dissolve quickly the other animals might also swallow the same.

Answered by KevinWeng

Question from Aaron McQueen:

I listened to Quirks and Quarks on CBC radio today where Dr. Barbara Block spoke about the "shark cafe" as a point about halfway between California and Hawaii where great white sharks congregate. She said they dive down very deep and it's not known for sure what attracts them to this isolated spot. I remember hearing on another episode of Quirks and Quarks about a study that showed that crabs can navigate their way to their "home" using receptors that are sensitive to the earth's magnetic field.

Answered by JasonHassrick

Question from Dave Weissman :

I know that due to a genetic bottleneck years ago, most elephant seals today are almost genetically identical. Yet during paternity studies, some 90% of the alpha male's ladies are fertilized by him. How was this determined? a nuclear DNA gene? allozyme comparisons?

Thanks for the answer.

Answered by ScottShaffer

Question from Jill Atherton:

Hi: I am researching information on sooty shearwaters for an educational tour to New Zealand. Are you continuing research into sooty shearwaters? Are you still tracking them? Can we see the tracks? Do you have any projects that focus on climate change?

Warm regards Jill A, Australia

Answered by HeidiDewar

Question from Rolena Johnette B. Pinero:

We all know that dolphins are taught many tricks and they can perform it well too. I am curious if there are countries that train sharks for entertainment just like dolphins do. Do they have the same characteristics as the dolphins? Can they or can they not perceive any tricks taught to them by humans?

Answered by HeidiDewar

Question from Brandon Thurman:

What is the best way for a college student to get an internship that would later become a career in working with elasmobranchs? I am especially interested in working with white sharks.

Question from Brian Lindsat:

One of your salmon sharks seems to be cruising through the Kluane National Parkland Reserve at 1 mph. Pretty far inland, too. Could it have been caught? Or is your Web site's Flash just a bit buggy?

Answered by JohnRyan

Question from William Frankebe:

What IS it that makes the ocean so red-brown and yellow sometimes?

Answered by ScottBenson

Question from Lin Renner:

I am one of three members of a Beachwatch team that surveys beaches for Gulf of the Farallones National Marine Sanctuary. We were in Pt.

Answered by BarbaraBlock

Question from James Symanski:

I was just watching a show on Discovery, which said that an abundance of sardines in Monterey Bay created a huge fishing & canning industry years ago. Then, the sardine population disappeared, due to over-fishing. Does that mean no more sardines exist in Monterey Bay? If so, can't we just re-introduce sardines into the Bay, which is now a marine sanctuary, to bring back this important species? James Symanski, Monterey, CA

Answered by DanielCrocker

Question from Suzie Parker:

Do crabeater seal eat crabs? Do they eat anything else?

Answered by SuzanneKohin

Question from :

Can you tell by looking at their teeth or measuring the length of their tails?

Answered by RussVetter

Question from Patricia King:

Is there evidence of mating bites on white sharks and other large sharks that have live offspring on underside of shark’s body?

Answered by KevinWeng

Question from Tom Horton:

What does the name "white shark cafe" mean? How do we know that whitesharks are there? What are they doing?