The Opinicus is a heraldic beast that differs from the griffin principally in that all four of its legs are those of a lion. It is typically shown with the short tail of a camel and sometimes with a longer neck like a camel's (but still feathered). An heraldic opinicus is shown as a male creature, whereas the winged griffin is female.
However, Parker says, "[it] is allied more nearly to the dragon in the forepart and in the wings; but it has a beaked head and ears, something between the dragon and the griffin. The hind part and the four legs are probably intended to represent those of a lion, but the tail is short, and is said to be that of the camel."
Their habitat is similar to that of a griffin.