Northern Mockingbird display (8x or more; took me that long to decide to capture)
http://www.allaboutbirds.org/guide/Northern_Mockingbird/lifehistory#
“The Northern Mockingbird frequently gives a “wing flash” display, where it half or fully opens its wings in jerky intermediate steps, showing off the big white patches. No one knows why it does this, but it may startle insects, making them easier to catch. On the other hand, it doesn’t often seem to be successful, and different mockingbird species do this same display even though they don’t have white wing patches.”

Northern Mockingbird
eruther
Dec 27, 2014
Waterbird Regional Preserve
Traveling
0.8 miles
77 Minutes
Observers: 2
All birds reported? Yes
Comments:
Submitted from BirdLog NA for iOS, version 1.8
14 Canada Goose
X Gadwall
X Mallard
8 Northern Shoveler
16 Green-winged Teal
X Bufflehead
2 Common Goldeneye
3 Hooded Merganser
6 Pied-billed Grebe
20 Double-crested Cormorant
2 Great Blue Heron
X Great Egret
X Snowy Egret
1 Turkey Vulture
1 White-tailed Kite
1 Red-tailed Hawk
1 American Kestrel
X American Coot
X Black-necked Stilt
1 Greater Yellowlegs
5 peep sp.
2 Bonaparte’s Gull
2 Ring-billed Gull
1 California Gull
6 Anna’s Hummingbird
3 Nuttall’s Woodpecker
3 Black Phoebe
1 Say’s Phoebe
2 Western Scrub-Jay
15 Bushtit
1 Ruby-crowned Kinglet
1 Northern Mockingbird
X European Starling
X Yellow-rumped Warbler
4 Yellow-rumped Warbler (Audubon’s)
3 Song Sparrow
X White-crowned Sparrow
X Golden-crowned Sparrow
X House Finch
1 Lesser Goldfinch