Are amano shrimp jumpers?

When I try to catch them at the LFS for other people, they tend to crawl around out of the water and even jump sometimes. I would definetely have a cover on the tank.
 
will they also prey on other dwarf shrimp?

Unlikely unless you starve them. This applies to even dwarf shrimp. I have had a crystal red shrimp eat a baby snowball shrimp before. I don't feed that tank, ever. So food source in there is probably scarce but enough for them to live off of. Although, I do feed them more often now :p
 
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