Some of the most fun, satisfying and difficult images to capture.

Here are some of my favorite BIFs.

Willet, Heron's Head Park, SF

Blue-faced Honeyeater, Port Douglas, Australia

Tree Swallow, Bay of Fundy, NS

Grey Heron, Bharatpur, India

Grey Heron, Bharatpur, India

Painted Stork, Bharatpur, India

Western Reef Egret, Surat, India

Tufted Puffin, Farallones

Atlantic Puffin, Reykjavik, Iceland

Ruby-throated Hummingbird, Murfreesboro, TN

Magnificent Frigatebird, Akumal, Mexico

Indian Roller, Surat, India

Rufous Treepie, Ranthambore, India

Great Kiskadee, Akumal, Mexico

Black Kite, Delhi, India

Turkey Vulture, Del Valle, CA

Osprey, Halifax, NS

Black-naped Tern, Australia

Least Tern, Akumal, Mexico

Forster's Tern, San Jose, CA

Elegant Tern, Half Moon Bay

Great Egret, Indore, India

White Ibis, Akumal, Mexico

Double-crested Cormorant, SF Bay

Yellow-billed Magpie, Del Valle, CA

Yellow-billed Magpie, Del Valle, CA

Red-shouldered Hawk, Del Valle, CA

Red-tailed Hawk, GG Park, SF

Band-tailed Pigeon Huddart Park, CA

Whimbrel, Heron's Head Park, SF

Great Shearwater, Bay of Fundy, NS

Common Eider, Bay of Fundy, NS

Brown Pelican, Half Moon Bay

Brown Pelican, Half Moon Bay

Brown Pelican, Half Moon Bay

White Pelican, Las Galinas, Marin

Northern Gannet, Bay of Fundy, NS

White-tailed Kite, Las Galinas, Marin

Black-footed Albatross, Farallones

Mute Swan, Marin

Northern Harrier, Marin

American Avocets, Houston

Royal Tern, Houston

Whiskered Tern, Alleppey

Sandhill Crane, Houston

Roseate Spoonbill, Houston

Sanderling, Houston

Snowy Egret, Las Gallinas

GBH, Las Gallinas

Mallard (female), Las Gallinas

Mallard (female), Las Gallinas

Mallard, Las Gallinas

Great-tailed Grackle, Las Gallinas

Northern Mockingbird, Las Gallinas

Brewer's Blackbird, Las Gallinas

Great Egret, Las Gallinas

Short-eared Owl, LRK

Brahminy Kite, Alleppey

Brahminy Kite, Alleppey

Brahminy Kite with catch, Alleppey

Brahminy Kite (juvenile), Alleppey

Crested Goshawk, Thattekad

Indian Pond Heron, Alleppey

Brandt's Cormorant, SF

Red-masked Parakeet, SF

Black Oystercatcher, SF

Pigeon Guillemot, SF

American Robin, SF

Eurasian Collared-Dove, SF

Scrub Jay, SF

Scrub Jay, SF

Belted Kingfisher, Crissy Field

Belted Kingfisher, Crissy Field

Belted Kingfisher, Crissy Field

European Starling, Crissy Field

Killdeer, Crissy Field

Western Meadowlark, Crissy Field

American Kestrel, Denver

American Kestrel, Denver

Bald Eagle, Denver

Blue Jay, Denver

Eurasian Collared Dove, Denver

Gadwall, Denver

Green-winged Teal, Denver

Northern Flicker, Denver

Northern Flicker, Denver

Northern Flicker, Denver

Mallard, Denver

Red-tailed Hawk, Denver

Ring-billed Gull, Denver

Ring-necked Duck, Denver

Ring-necked Pheasant, Denver

Rough-legged Hawk, Denver

American Kestrel, Denver

American White Pelican, Denver

Black-billed Magpie, Denver

Black-bellied Plover, Arrowhead Marsh

Marbled Godwit, Arrowhead Marsh

Willet, Arrowhead Marsh

Cedar Waxwing, Valencia

Phainopepla, Valencia

Phainopepla, Valencia

Phainopepla, Valencia

Black-shouldered Kite, Surat

Rose-ringed Parakeet, Surat

Allen's Hummingbird, GGP

Allen's Hummingbird, GGP

Bald Eagle, Napa River

Cliff Swallow, Napa River

GBH, Napa River

Mallard female, Napa River

Osprey with catch, Napa River

Osprey, Napa River

Peregrine Falcon, Napa River

RTH, Napa River

Ring-billed Gull, Napa River

Tree Swallow, Napa River

Clark's Nutcracker, Carson's Pass

Clark's Nutcracker, Carson's Pass

Osprey, Lake Tahoe

Osprey, Lake Tahoe

Peregrine Falcon, HHP

Belted Kingfisher, HHP

Anna's Hummingbird, Fort Mason

Anna's Hummingbird, Fort Mason

Red-masked Parakeet, Fort Mason

Anna's Hummingbird, Fort Mason

Anna's Hummingbird, Fort Mason

Brown Pelican

Elegant Tern

Northern Fulmar

Pink-footed Shearwater

Short-tailed Shearwater

Sooty Shearwater

South Polar Skua

Common Shelduck, GRK

Desert Wheatear (female), GRK

Desert Wheatear (female), GRK

Eastern Imperial Eagle, GRK

Greater Spotted Eagle, GRK

Greater Spotted Eagle, GRK

House Crow, GRK

Intermediate Egret, GRK

Long-legged Buzzard and Steppe Eagle, GRK

Pallas's Gull, GRK

Pallid Harrier (female), GRK

White-bellied Minivet (male), GRK

Oriental Honey-buzzard (male), GRK

Black-headed Gull, GRK

Black-headed Gull, GRK

Black-winged Stilt, GRK

Black-winged Stilt, GRK

Brown-headed Gull, GRK

Common Crane, GRK

Crab Plover, GRK

Crab Plover, GRK

Curlew Sandpiper, GRK

Eurasian Curlew, GRK

Eurasian Marsh Harrier, GRK

Grey Heron, GRK

Gull-billed Tern, GRK

Gull-billed Tern, GRK

House Crow, GRK

House Crow, GRK

Indian Cormorant, GRK

Lesser Sand Plover, GRK

Pallas's Gull, GRK

Pied Avocet, GRK

Red-wattled Lapwing, GRK

Red-wattled Lapwing, GRK

Sanderling, GRK

Steppe Eagle, GRK

Western Reef Egret, GRK

American Crow, Las Gallinas

Anna's HB, Las Gallinas

Anna's HB, Las Gallinas

Belted Kingfisher, Las Gallinas

Caspian Tern

Cliff Swallow, Las Gallinas

Green Heron, Las Gallinas

Mute Swan, Las Gallinas

Northern Rough-winged Swallow, Las Gallinas

Northern Rough-winged Swallow, Las Gallinas

Northern Rough-winged Swallow, Las Gallinas

Snowy Egret, Novato

Snowy Egret, Las Gallinas

Tree Swallow (juvenile), Las Gallinas

Tree Swallow (juvenile), Las Gallinas

Vaux's Swift

White-tailed Kite, Las Gallinas

Ring-billed Gull pirating Forster's Tern, Shoreline

Sandpiper sp., Shoreline

Snowy Egret, Shoreline

BAEA (Immature), Hawk Hill

Black Oystercatcher, HHP

Black Oystercatcher, HHP

Elegant Tern, Shoreline

Northern Flicker, Presidio

Scrub Jay, Lake Merced

TUVU

Whimbrel, HHP

Whimbrel, HHP

Whimbrel, HHP

American Avocet, Redwood Shores

American Wigeon (female) poop shot, Redwood Shores

American Wigeon (female) poop shot, Redwood Shores

American Wigeon, Redwood Shores

American Wigeon, Redwood Shores

American Wigeon, Redwood Shores

American Wigeon, Redwood Shores

American Wigeon, Redwood Shores

Canvasback (female), Redwood Shores

Canvasback, Redwood Shores

Canvasback, Redwood Shores

Canvasback, Redwood Shores

Common Goldeneye (immature), Redwood Shores

Green-winged Teal, Redwood Shores

Green-winged Teal, Redwood Shores

Black-crowned Night-Heron (juvenile), Coyote Hills

Northern Harrier, Coyote Hills

Northern Harrier, Coyote Hills

Sharp-shinned Hawk, Coyote Hills

Sharp-shinned Hawk, Coyote Hills

Tree Swallow, Coyote Hills

Tree Swallow, Coyote Hills

Tree Swallow, Coyote Hills

American Avocet, Redwood Shores

Black-crowned Night Heron, Coyote Point