In a feeder for dispensing flowable feed material, such as potable liquids and particulate solids, to birds and other animals, in which a hopper supplies such feed material to an access port in a feeding station positioned below the hopper, a refilling feature permits facilitated replacement of feed stock, as necessary. A hopper, for example a feed containing reservoir, is mountably receivable on a feeder support structure, which, while mounted thereto, is pivotable between an inverted position, in which an opening therein is appropriately located to permit outflow of feed therethrough while actively providing feed material to the feeding station for animal access, and another position in which the reservoir opening is oriented to prevent outflow of feed, thereby permitting removal of the reservoir from the feeder for refilling, or replacement thereof with a pre-filled replacement reservoir, without significant spillage of the contents. A feeder incorporating such feature advantageously includes mounting structure to facilitate mountable reception of same on a cage, or outdoor tree or other support, such mounting structure being disposed as not to impede the mounted movement of the feed reservoir.