The eku (Arena eku) is domestic cat-sized crepuscular primeval and common prey.
Picture
Generic individual.

Averages

Shoulder height: 30 cm
Length without tail: 30 cm - 50 cm
Tail length: 20 cm - 40 cm
Weight: 2 kg - 4 kg
Top speed: 57 km/h 
Coat: Short
Temperature tolerance: 25°c to 40°c
Diet: Herbivore
Cyclicity: Crepuscular
More to come.
Picture
An eku under Aleyius' control.