does not 34 flip up 34 which is a motion which would be startling to an animal and may be so frightening and traumatic that the animal would simply starve rather than to risk confrontation with such a device further the present linkage system provides a slight downward slope to lid 12 and forward lip 13 which acts as a rain lid the linkage system lends itself to easy economical manufacture by the use of injection molding of strong plastic components for most of the parts used herein it is further noted particularly in reference to fig2 that as lid 12 opens in response to pressure being applied to pressure plate 11 in the direction of arrow 20 that lid 12 not only moves upwardly in the manner described above but also rearwardly and away from the location of an animal standing upon pressure plate 11 such a movement would again be least likely to frighten an animal causing an animal to lurch from pressure plate 11 thus causing lid 12 to close it is further contemplated that support arm 23 and in turn lid 12 be biased by spring assembly 30 whereby lid 12 remains covering open top 18 of bin 16 unless an animal of sufficient weight to overcome the bias steps on the pressure plate as such when.