Title Credit Analysis: Hitchcock's 'The Birds'

In this opening sequence, crows fly across the screen and piece together the opening credits. The lettering is in light blue, creating a stark contrast to the grey background and the black crows. Blue is usually associated with tranquility and calmness, again contrasting the erratic and wild nature of the birds. The special effects/shots of the attacking birds was done by animator/technician Ub Iwerks, who used the sodium vapour process ("yellow screen") which he had helped to develop. The SV process films the subject against a screen lit with narrow-spectrum sodium vapor lights. 
Hitchcock decided to do without any conventional incidental score, deciding instead to make use of sound effects and spare source music in counterpoint to calculated silences and used an electroacoustic Trautonium to create the bird calls and noises. It is a combination of diegetic and non diegetic sound. The sinister non-diegetic 'music' in the sequence, combined with the diegetic sound of the birds sqwaking and flapping creates a sense of impending danger, leading the audience to wonder what the film may be about. 
The space within the frame has been used efficiently. The lettering is a suitable size and the movements of the birds do not distract the viewer too much from reading the credits. The proximity of the birds to screen and the audience (particularly if seen on the convex cinema screen of the time) would have created an atmosphere of discomfort, unease and claustrophobia, especially if a viewer has Ornithophobia.