image credits

saw toothed grain beetle
https://www.flickr.com/photos/30703260@N08/14438947353/

wasp bee
https://www.flickr.com/photos/memotions/1118805375/in/photostream/

ticks
https://www.flickr.com/photos/fairfaxcounty/7209178448/in/photostream/

pixabay wasp
http://pixabay.com/en/bee-flower-insect-wildlife-honey-422795/

cockroach
https://www.flickr.com/photos/miran/59465869/in/photostream/

cricket
https://www.flickr.com/photos/mr_t_in_dc/5095745306/in/photostream/

earwig
https://www.flickr.com/photos/micks-wildlife-macros/3382880520/

fleas [must be paid for] > http://www.shutterstock.com/pic-71639218/stock-photo-flea-or-human-flea-pulex-irritans-isolated-on-a-white-background.html?src=4kdA5ByzXQbOzl8UScDsdg-1-0

fleas [public domain] >

flea bites [] http://commons.wikimedia.org/wiki/File:Fleabite.JPG

rat
https://www.flickr.com/photos/astridbussink/4808304467/in/photostream/

street rat
http://en.wikipedia.org/wiki/File:Street-rat.jpg

silverfish
https://www.flickr.com/photos/7874324@N02/2377479113/

spider – black widow
https://www.flickr.com/photos/jurvetson/9824752134/