A feed storage vessel (1) for an animal feeder (10), constituted of an inverted truncated cone-shaped hopper (2) whose smaller lower base features a generally cylindrically-shaped end elongation (3b), and of two lateral supporting sections (4a,4b), apparently identical to each other, each of which features a lower portion (5a,5b) for its mutual connection to the other supporting section, both lower portions being intended to encircle the lower end elongation of the hopper and/or to act as a support for the aforementioned hopper, likewise each lateral supporting section featuring an essentially flat, vertical portion (6a,6b), intended to adopt a position on the same plane as the analogous portion of the other supporting section, a plane which comprises the imaginary axis (7) of the hopper.