Mars Animal Gets Eaten by Another Creature When Rover Drill Scares it, @NASA Source, Oct 2016

Date of sighting: Oct 2016
Location of sighting: Mars, Sol 882
NASA Source: http://mars.jpl.nasa.gov/msl/multimedia/raw/?s=50#/?slide=882

Here you see the Curiosity rover drilling into the dirt on Mars and as it is, a small critter is seen walking away from the drill area. To top it off, the small creature walks just a little ways, before something even bigger stretches out from below a rock and snags it. You see one arm in front of it, and a second behind it. So there is life on Mars, but its a vicious and short life to be had. 

If you have trouble seeing it, then please hit the video below and make if full screen and in HD mode. You will see it at 45 seconds into the video. Found by Youtube user Mars Alive, its really an extraordinary find, and very lucky. Sadly, the Curiosity rover is responsible for this creatures death, since it scared it off, only be eaten by some hungry predator with long arms. 

It almost looks like a sharp triangle rock is actually a crab like creature that grabbed this first dark animal. Now do you remember about 6 years back a rock labeled “the Mars Donut,” was seen to have moved, even though it was big. And the first time the Russian lander landed on Mars, a similar crab-like object was seen in one photos, but disappeared in the next photo, so what we have here is a smaller creature eaten by a larger one that can appear like a rock, but move a high speeds when attacking. 
Scott C. Waring