Asian small-clawed otter (Aonyx cinerea): 52, 54, 85
Cape clawless otter (Aonyx capensis): cover, 9, 10, 41, 44, 86
Channelized river: 12
Congo clawless otter (Aonyx congica): 6, 45, 82
Contaminated stream: 12
Degraded stream: 14
Eurasian otter (Lutra lutra): 2, 6, 13, 18, 19, 29, 32, 34, 37, 40, 49, 60, 87
Fish kills from pullution: 11
Giant otter (Pteronura brasiliensis): 67, 68, 72, 83
Hairy-nosed otter (Lutra sumatrana): 63
Marine otter (Lutra felina): 5, 70

Neotropical otter (Lutra longicaudis): 64, 66
North American river otter (Lutra canadensis): 1, 5, 20, 78, 79
Otter resting place: 8
Prime otter habitat: 3
Reconstruction work: 16
Spotted-necked otter (Lutra maculicollis): 9, 42, 47, 48, 50
Sea otter (Enhydra lutris): 7, 23, 26
Smooth otter (Lutra perspicillata): 2, 17, 56
Southern river otter (Lutra provocax): 65, 69