Trussed animals with bounded legs are food offerings. They are mostly foundation deposits with no suspension means and are mainly in red materials (jasper, sandstone, carnelian, faience and glass). They appeared in Dynasty 18, but were only found in situ on the torso of Late Period mummies1

Red jasper L 2.0, H 1.6, T 0.9
Presumably New Kingdom
Private collection DA

 Red Jasper L 2.3, H 1.6, T 1.0
New Kingdom
© 2013 Musée du Louvre/
Antiquités égyptiennes #AF 11708

References

1Andrews C. Amulets of Ancient Egypt, 1994, p. 91 and Fig. 92c