Trapfinding allows spot traps above DC 20 in 3.5 (and allows disarm magical traps). While in pathfinder it adds perception spot them and any class can spot traps of any DC.<br/><br/>So send familiar in as first recon, then Wren is first also as she got better spotting abilities. Familiar is distance scout as it can move undetected farther ahead and via emphatic link sense if it spots 'danger'.