max_carabus's Identifications

Link to American Robin observation: https://www.inaturalist.org/observations/117185426
Three Earthworms were pulled from lawn in 5 minute period by adult male robin who was demonstrating earthworm hunting to juvenile robin on fence.

Common Earthworm (Lumbricus terrestris) Introduced, naturalized reddish worm of the Earthworm (Lumbricidae) family. It is frequently seen on the surface, unlike most other earthworms. It has a hydrostatic skeleton and moves by longitudinal and circular muscular contractions. The worm is relatively large, pinkish to reddish-brown in color, generally 110–200 mm (4.3–7.9 in) long and about 7–10 mm (0.28–0.39 in) in diameter. It has around 120-170 segments, often 135-150. The body is cylindrical in the cross section, except for the broad, flattened posterior section. Head end dark brown to reddish brown lateral, dorsal pigmentation fading towards the back.

Earthworms (Family Lumbricidae) From Wikipedia, the free encyclopedia
"An earthworm is a tube-shaped, segmented worm found in the phylum Annelida. They are commonly found living in soil, feeding on live and dead organic matter. Its digestive system runs through the length of its body. It conducts respiration through its skin. An earthworm has a double transport system composed of coelomic fluid that moves within the fluid-filled coelom and a simple, closed blood circulatory system. It has a central and a peripheral nervous system. The central nervous system consists of two ganglia above the mouth, one on either side, connected to a nerve cord running back along its length to motor neurons and sensory cells in each segment. Large numbers of chemoreceptors are concentrated near its mouth. Circumferential and longitudinal muscles on the periphery of each segment enable the worm to move. Similar sets of muscles line the gut, and their actions move the digesting food toward the worm's anus.
Earthworms are hermaphrodites—each individual carries both male and female sex organs. They lack either an internal skeleton or exoskeleton, but maintain their structure with fluid-filled coelom chambers that function as a hydrostatic skeleton."