Tiny Amigurumi Hippo Pattern is written pattern (pdf) with series of photos to help you.

Size: with 2,5mm crochet hook:
Approx. 11 cm/4,3 inches

Tools and materials what you´ll need:
2,5 mm crochet hook
YARN: Katia Bamboo, DK /8 ply, Meterage 109 yards (100 meters)
Unit weight 50 grams (1.76 ounces), amount: 1 ball
8-10mm safety eyes and a yarn needle.

Stuffing: for tiny body parts like legs I like to use sheep wool and for ohter body parts the usual toy stuffing (fiberfill, polyfill)