The champ

The world's most fecund vertebrate.  Mola mola, the ocean sunfish, females of which may release as many as 300 million eggs at a time. 

Invasion ingestion

Lionfish are well established as an invader in the Western Atlantic, and the prognosis doesn't look good.  A new paper appearing in the journal Biological Invasions indicates that, to decrease populations, 27% of adults would have to be removed annually.  There is one bright spot, though, that could help stem the tide of the invasion.  Apparently, they taste great, with a flavor like that of grouper or snapper.  Hence, NOAA's "Eat Lionfish" campaign.

A couple of my students (one former, one current) have spent some time this summer catching lionfish.  Have to find out if they've tried them on the grill.

Last rhino

No, not the very last rhino.  The last adult at South Africa's Krugersdorp Game Reserve.  Shot and left to bleed to death after her horn was severed.  A horn made of essentially the same material as your fingernails, but valued as in traditional Chinese medicine.  And it's safe to predict that this is the fate that will, in fact, befall the very last one unless we somehow deal with these idiots.  Must say that I agree with P. Z. Myers' take on the solution.