Bullock Oriole - at Shrike loc. 6. Apr 25 - Males heard for some Time - about a month and sang hard. - Females present for a week I am sure and probably longer. Today noticed pair at bridge trying to invade the tree by the bridge held by another pair. The pair (A) would dash into the tree owned by B from the tree E in ravine - males would clash & a return to Bridge rail - sometimes chased off if here. - Female B would dart around pair but close and screech as scratch the harsh note that the AB yave. Female A would commonly 6-7 times, lead way to the - male following - once male went and female followed. Female B once jumped at & A as BB attached A & when all four in tree by bridge. Pair A when repulsed at bridge would sit on top and of them chase