OPEN	TITLE	DESCRIPTION
	Colour Vision in Humans	The sensation of colour stems from the differential stimulation of the different types of photoreceptors in the retina.
	Fundamentals of Vision	The production of a neural image of the light converging upon an animal begins with the focusing of that light onto a sheet of receptors.
	Nature's Flight	Flying characteristics of birds and bats.
	Prevention and Control Methods	Constructing enclosures or suspending parallel wire or monofilament strands over an area.
	USDA Research	Fact Sheet on Managing Gull Damage