Re: possible role of echolocation in K-T survival

[Jonathon Woolf <jwoolf@erinet.com>]

Betty Cunningham wrote:

> Sperm whales have the largest extant eyes I know of, and they use
> sonar.  Not quite the proportions of an Ichthyosaur however.
> Would something like a melon be traceable in the fossil record?  Would
> it be possible to have a non-mammalian melon?

For ichthyosaurs it might well be, since they've been decent enough to leave us
a great many carbonized-outline fossils, full skeletons that also retain faint
outlines of the body shape and dimensions.

-- JSW