Summon Spirit Animal

Totemic Druids may Summon Spirit Animal to their aid.

In-game description
"The summoner calls on a special spirit animal (spirit bear, spirit wolf, spirit lion, or spirit snake) to aid  for 6 turns. The spirit animal has 1 HD at level 1, 3 HD at level 3, 5 HD at level 5, 7 HD at level 7, and 10 HD at level 10."

Sources & references

 * Tresset's post in Totemic Druid's Spirit Animal Stats thread