Play Behavior of Wild Grey Seals (Halichoerus grypus): Effects of Haulout Group Size and Composition Survilienė, Vaida ; Rukšėnas, Osvaldas ; Pomeroy, Patrick Abstract Publication: Aquatic Mammals Pub Date: June 2016 DOI: 10.1578/AM.42.2.2016.144 Bibcode: 2016AqMam..42..144S