Amphibian horror isn't a
movie type, but on this proof perhaps it should be. Harvard biologists have
described a strange, hairy frog with cat-like extendable claws.
Trichobatrachus
robustus vigorously breaks its own bones to produce claws that puncture
their way out of the frog's toe pads, most likely when it is threatened.
David Blackburn and colleagues at Harvard University's Museum,
think the ghastly behavior is a defense mechanism.
Some other frogs have scrawny spines that assignment from their
wrist, but in those classes it appears that the bones grow through the skin
rather than pierce it when needed for defense.
The researchers state there are salamanders that strength their
ribs through their skin to produce protective barbs on demand, but nothing
quite like this mechanism has been seen before.
The characteristic is also found in nine of the 11 frogs
belonging to the Astylosternus
genus, most of which live in Cameroon.