Here is a list of links on more specialized resources on mammalian and avian vision:

Webvision (the organization of the retinal and visual system): http://webvision.med.utah.edu/

Ecology of vision: exploring the fourth dimension: http://www.bio.bris.ac.uk/research/behavior/icc_vis.htm

Bird Nervous System: Brain and Special Senses II: http://people.eku.edu/ritchisong/birdbrain2.html

If you would like to look for more specialized information about animal vision, you can search for scientific papers at PubMed.