Twitter allows large-sized images in the profile?

Normally if we click on the profile image of Twitter profile, the profile image/picture will be opened with almost same size (i-e small size)

But, I have noticed that some profile images are getting displayed in very large size when clicking on them.

You can see this large image in profile of ericschmidt (Google CEO) and ipl

If anybody knows how to bring this large profile picture/image, you can explain it thro' comments.

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