Graphics by Nathan(CC-BY-SA 4.0)
mobs_penguin
mobs_walrus1
mobs_walrus2

Graphics by DuCake (CC-BY-SA 4.0)
mobs_penguin_tux

Sound:
Penguin_chirrup.ogg
Tai "DuCake" Kedzierski CC-BY-SA 4.0

Walrus sounds
AlexTriceratops123 CCA