(General)
The creatures you summon have evolved to have even greater abilities.
Prerequisites
Augment Summoning,
Spell Focus (conjuration), ability to cast summon monster I.
Benefit
Each time you cast a summon monster spell, you can select a 1-point evolution other than
Pounce or reach from those available to a
Summoner's eidolon. Your summoned creature gains this evolution. The summoned creature must conform to any limitations of the evolution. (For instance, only a creature with a reach of 10 feet or greater can have the pull evolution.) Evolutions that grant additional attacks or enhance existing attacks can be applied only to Medium or larger summoned creatures. If you summon more than one creature with a single spell, only one creature gains the evolution.
Special
You can take this feat multiple times. Each time you do, select an additional 1-point evolution for one of your summoned creatures. If you summon more than one creature, you can apply all the chosen evolutions to a single summoned creature or split them between the creatures.