Ex: grab for a quadruped

[prometheus's_curse]

So when looking at the CMB for a quadrupeds I noticed that they seem to have a +4 bonus on grabs (If they have Ex grab). Am I correct in assuming that quadrupeds have a bonus on grabs or is this for another reasons?

(Dire, Lion)
http://www.d20pfsrd.com/bestiary/monster-listings/animals/cat-great/lion/di re-lion

[johnlocke90]

Anyone with Grab gets a +4.

[prometheus's_curse]

cool!

[prometheus's_curse]

does this apply to trip as well?