European otter was created in 1758.
a European otter is way cuter
To the River Otter was created in 1793.
Otter Press was created in 1998.
Lottie the Otter was created in 2009.
An Otter Study was created in 1912.
The Odyssey of an Otter was created in 1960.
Otter Tail Corporation was created in 1909.
Otter Creek Observatory was created in 1995.
Spotted-necked otter was created in 1835.
Otter Co-op was created in 1922.
I think mammals... but I am not 100% sure...
River Otter (3 species), Sea Otter, Giant Otter, Hairy Nosed Otter, Japanese Otter, European Otter, Spotted Necked Otter, Marine Otter, African Clawless Otter, Oriental Small Clawed Otter. 13 species