Here is a list of animals, and I am going to divide these into predator and prey.
Tarantula
Piranha
Rabbit
Poisonous Dart Frog
Zebra
Barn Owl
Grasshopper
Lion
Scorpion
Vole
Bed Bugs
Komodo Dragon
PREDATOR
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Tarantula
Tarantula: Predator because because it a carnivore hunts for insects and digest using its digestive juice in its body.
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Poisonous Dart Frog
Poisonous Dart Frog is a predator because it's carnivores which eats insects and has poison for that reason. 
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Lion


Lion is a predator as it is a carnivore and hunts for prey like zebras and deer


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Scorpion
Scorpion is a predator ready with poison to kill the prey.    
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Komodo Dragon
Komodo Dragon is a predator ready with poison in its tongue to kill prey when it bites.
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Barn owl
Barn Owl is a predator and is nocturnal and hunts for mouse and smaller birds    
PREY 
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Rabbit
Rabbit is a prey because it's a herbivore.




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Grasshopper
Grasshopper is a piranha that eats crops and gets eaten by tarantulas and frogs. 

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Vole
Vole is a prey because it's herbivores that eats seeds and nuts and is hunted by animals like barn owl.    
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Zebra

Zebra is a prey as it is a herbivore that eats grass and is eaten by lions.    
BOTH
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Piranha
Piranha is a predator and a prey. Since it eats meat off from fish and even humans using their strong and sharp teeth but it can be eaten by other animals too, such as human and birds.
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Bedbug
Bed Bugs can be both predator and prey as it eats human blood and is eaten by insects like mantis    

What are predators and preys?
I think predators are organisms that eat other organism. Preys are organism that eat by predators.  

THANKS:
Long Hin Mak 
https://www.google.com.hk/imghp?hl=zh-CN&tab=wi

Tarantula image: 
http://www.google.com.hk/imgres?&hl=zh-CN&safe=strict&gbv=2&addh=36&tbm=isch&tbnid=nxpB445rECxBvM:&imgrefurl=http://reptilesalive.com/news/tag/haitian-tarantula/&docid=aQq-Qrb1R7UnCM&imgurl=http://reptilesalive.com/news/wp-content/uploads/2009/11/Tarantula_haitian.jpg&w=711&h=503&ei=wIKLT7a8KsWNiAes6JDCCQ&zoom=1&iact=rc&dur=224&sig=106730144190205004147&page=7&tbnh=101&tbnw=143&ndsp=12&ved=1t:429,r:10,s:63,i:167&tx=53&ty=56&biw=772&bih=364
Piranha Image:
http://www.google.com.hk/imgres?hl=zh-CN&safe=strict&gbv=2&addh=36&tbm=isch&tbnid=JL8DMm9ATI0FQM:&imgrefurl=http://www.iciba.com/piranha&docid=YlU0cRVsKRVrXM&imgurl=http://attach.www.iciba.com/attach//1d/ae/1dae66d0ff1e3f7e417af8a48d2ca04d.jpg&w=376&h=282&ei=YYKLT_X_NsSdiAeptdDwCQ&zoom=1&iact=rc&dur=329&sig=106730144190205004147&page=1&tbnh=162&tbnw=209&&ndsp=3&ved=1t:429,r:1,s:0,i:7&tx=172&ty=83&biw=772&bih=364
Poisonous Dart Frog Image:
 http://www.google.com.hk/imgres?hl=zh-CN&safe=strict&gbv=2&tbm=isch&tbnid=Y3a4i1JkkPEYaM:&imgrefurl=http://www.worldmostamazingthings.com/2011/09/amazing-poison-dart-frog-poison-frog.html&docid=OA08dLsvsCIOdM&imgurl=http://3.bp.blogspot.com/-g73dSe8Z8Ec/TnmDn6U_9tI/AAAAAAAADu0/XsJ1FGlI5oU/s1600/Poison-dart-frog.jpg&w=500&h=401&ei=AIOLT-y7KuyYiAfhoujZCQ&zoom=1&iact=rc&dur=335&sig=106730144190205004147&page=2&tbnh=110&tbnw=141&&ndsp=12&ved=1t:429,r:8,s:3,i:100&tx=46&ty=56&biw=772&bih=364

Zebra Image: 
http://www.google.com.hk/imgres?hl=zh-CN&safe=strict&gbv=2&tbm=isch&tbnid=5o__9a7WWB_usM:&imgrefurl=http://www.flickr.com/groups/bestshotofwildlife/discuss/72157624186327312/&docid=Fa6SGHRyiHJ6tM&imgurl=http://farm2.static.flickr.com/1416/747376823_04bd225338.jpg&w=500&h=376&ei=TIOLT7rSOc-XiQf5x9HtCQ&zoom=1&iact=hc&vpx=188&vpy=42&dur=15&hovh=195&hovw=259&tx=103&ty=104&sig=106730144190205004147&page=7&tbnh=113&tbnw=192&&ndsp=12&ved=1t:429,r:9,s:63,i:243&biw=772&bih=364
Barn owl image:
http://www.google.com.hk/imgres?hl=zh-CN&safe=strict&gbv=2&tbm=isch&tbnid=gPJB3ozNgZPNcM:&imgrefurl=http://theworldsight.blogspot.com/2011/12/barn-owl-tyto-alba.html&docid=gbihgpueJIGeJM&imgurl=http://1.bp.blogspot.com/-BFEsqAL0zBM/TtrNhXM5_gI/AAAAAAAAApg/wecaYNfp2Rc/s1600/barn_owl-kevin.jpg&w=420&h=600&ei=jYOLT8_VKKWRiQf_p4XKCQ&zoom=1&iact=rc&dur=277&sig=106730144190205004147&page=2&tbnh=111&tbnw=73&&ndsp=15&ved=1t:429,r:6,s:4,i:94&tx=51&ty=52&biw=772&bih=364
Lion image: 
http://www.google.com.hk/imgres?hl=zh-CN&safe=strict&gbv=2&tbm=isch&tbnid=C5zDwRzganu_xM:&imgrefurl=http://www.bbc.co.uk/bigcat/animals/lions/lions.shtml&docid=Kdjb1CH-92YllM&imgurl=http://www.bbc.co.uk/bigcat/animals/images/lions/lion2.jpg&w=446&h=249&ei=8IOLT_TQJauSiQea3_HXCQ&zoom=1&iact=hc&vpx=422&vpy=68&dur=1518&hovh=168&hovw=301&tx=167&ty=111&sig=106730144190205004147&page=2&tbnh=113&tbnw=164&&ndsp=13&ved=1t:429,r:12,s:3,i:109&biw=772&bih=364
Scorption image: 
http://www.google.com.hk/imgres?hl=zh-CN&safe=strict&gbv=2&tbm=isch&tbnid=g3qjqu4sRq6JUM:&imgrefurl=http://lhs204.stellpflug.com/Period%25205/Amandeep%2520Kaur/scorpion.html&docid=jFNHDUAJr7El5M&imgurl=http://lhs204.stellpflug.com/Period%2525205/Amandeep%252520Kaur/images/scorpions%252520pic.gif&w=445&h=389&ei=XYSLT4KtBKSZiAeY2sXrCQ&zoom=1&iact=hc&vpx=255&vpy=4&dur=166&hovh=210&hovw=240&tx=144&ty=143&sig=106730144190205004147&page=1&tbnh=162&tbnw=182&&ndsp=3&ved=1t:429,r:1,s:0,i:73&biw=772&bih=364
Komodo Dragon image:
http://www.google.com.hk/imgres?hl=zh-CN&safe=strict&gbv=2&tbm=isch&tbnid=tXzgEWi0_jfC7M:&imgrefurl=http://my.opera.com/rezalisni/albums/showpic.dml%3Falbum%3D5464522%26picture%3D82306042&docid=ye8eYvPUGJg9wM&imgurl=http://files.myopera.com/rezalisni/albums/5464522/MRL_3019.jpg&w=1936&h=1296&ei=EoWLT7hUka2JB8ua0bUJ&zoom=1&iact=hc&vpx=18&vpy=5&dur=1255&hovh=184&hovw=275&tx=178&ty=124&sig=106730144190205004147&page=4&tbnh=114&tbnw=186&&ndsp=12&ved=1t:429,r:8,s:27,i:157&biw=772&bih=364
Rabbit image:
http://www.google.com.hk/imgres?hl=zh-CN&safe=strict&gbv=2&tbm=isch&tbnid=IIvTxKy8Kmh0mM:&imgrefurl=http://www.wallcoo.com/animal/rabbit/html/wallpaper21.html&docid=3AL8QfDk-gIrpM&imgurl=http://www.wallcoo.com/animal/rabbit/images/%25255Bwallcoo_com%25255D_Lovely_rabbit_Picture_da033008s.jpg&w=700&h=525&ei=3oKLT9j7JeKoiAfu8rS8CQ&zoom=1&iact=rc&dur=234&sig=106730144190205004147&page=1&tbnh=162&tbnw=200&&ndsp=3&ved=1t:429,r:1,s:0,i:73&tx=87&ty=108&biw=772&bih=364
Grasshopper image:
http://www.google.com.hk/imgres?hl=zh-CN&safe=strict&gbv=2&tbm=isch&tbnid=5-lyya-fFbYuCM:&imgrefurl=http://www.grasshoppercontrol.com/&docid=BOpN8opoZcWntM&imgurl=http://www.grasshoppercontrol.com/two-striped%252520grasshopper.jpg&w=615&h=480&ei=yoOLT6quGe6aiAfH873pCQ&zoom=1&iact=hc&vpx=284&vpy=43&dur=321&hovh=162&hovw=236&tx=124&ty=109&sig=106730144190205004147&page=1&tbnh=162&tbnw=236&&ndsp=3&ved=1t:429,r:1,s:0,i:70&biw=772&bih=364
Vole image:
http://www.google.com.hk/imgres?hl=zh-CN&safe=strict&gbv=2&tbm=isch&tbnid=Phhe9fmXB86ftM:&imgrefurl=http://www.naturephoto-cz.com/bank-vole-photo-2969.html&docid=s-7pebYIDDXhqM&imgurl=http://www.naturephoto-cz.com/photos/andera/bank-vole-13043.jpg&w=600&h=504&ei=jISLT-y-MMSSiQebxvDDDg&zoom=1&iact=hc&vpx=147&vpy=45&dur=1279&hovh=206&hovw=245&tx=141&ty=180&sig=106730144190205004147&page=1&tbnh=91&tbnw=108&&ndsp=10&ved=1t:429,r:1,s:0,i:66&biw=772&bih=364
Bedbug image:
http://www.google.com.hk/imgres?hl=zh-CN&safe=strict&gbv=2&tbm=isch&tbnid=-iY6WJgT73W2GM:&imgrefurl=http://www.goodreads.com/book/show/10749460-bedbugs&docid=XbavTD1hn_tRYM&itg=1&imgurl=http://i156.photobucket.com/albums/t9/bugmenotgirl/bedbug.jpg&w=450&h=338&ei=t4SLT9WSCIWgiQeo16zmCQ&zoom=1&iact=hc&vpx=480&vpy=22&dur=1117&hovh=194&hovw=259&tx=119&ty=94&sig=106730144190205004147&page=2&tbnh=107&tbnw=158&&ndsp=12&ved=1t:429,r:7,s:3,i:96&biw=772&bih=364