More meaningful avatar names

img/avatars/buffalo001.jpg

img/avatars/butterfly001.jpg

img/avatars/butterfly002.jpg

img/avatars/butterfly003.jpg

img/avatars/cat001.jpg

img/avatars/cat002.jpg

img/avatars/cat003.jpg

img/avatars/cat004.jpg

img/avatars/cat005.jpg

img/avatars/cat006.jpg

img/avatars/cat007.jpg

img/avatars/cat008.jpg

img/avatars/cat009.jpg

img/avatars/cat010.jpg

img/avatars/chicken001.jpg

img/avatars/crow001.jpg

img/avatars/deer001.jpg

img/avatars/dog001.jpg

img/avatars/dog002.jpg

img/avatars/dog003.jpg