I use to capture praying mantis and keeping them on a terrarium. They are the most ferocious and tenacious predators I know.
Lions? Sharks? Giant Spiders? Nah! Mantis yeah!
I begun creating some tarantulas. They are nice, beautiful, but once they catch their prey, they hide and get quiet for weeks!
But a praying mantis, hey, they are amazing - you throw a living prey inside the terrarium, sit and watch. 30 seconds after, they catch and imediately begin to eat! And if you throw another pray while the little guy is still eating, they can even keep the first prey in one hand and catch the other with the free hand!
And they don't rest like spiders do!
I tried to buy exotic praying mantis from
this site
, but the vendor said that the mantis can't stand such a long distance shiping - so, I stick with brazilian specimens.
Mantis can eat any living prey they can squeeze - and depending on the size of the mantis, he can even capture flying hummingbirds, little fishes and even snakes!
Edit: google it for "mantis vs snake youtube", or "mantis vs hummingbird", or "mantis eating goldfish". There is one youtube movie showing a mantis eating the tip of a human's finger (actually, the finger of the guy that was recording the movie). Sick, but cool...