Brown pelican- the original smart bomb

If you can remember back to the Gulf War, TV news showed us footage from nose cameras on the first generation smart bombs as they homed in and hit their targets. It is interesting to note we no longer are shown that type of footage, but that’s a different story. I shot a loose group of California brown pelicans hunting off Point Joe in Monterey yesterday, and it brought to mind those videos.

The most elegant of our local birds... the brown pelican.

The pictures below illustrate how they hunt, still images reveal details you can’t see in real time. They find dinner not unlike smart bombs- first they visually acquire their prey. Then they transition from soaring into a high speed crash into the water. I’ve seen them just stop flying and fall from the sky, or they may gracefully ease into a dive. They hunt from different altitudes to match prey, sun angle and water conditions, from as low as a few feet off the surface to up over a hundred feet. At times they scream into the frigid Pacific completely vertical.

Before the dive they soar over their hunting grounds, which can be the open ocean, a bay or an estuary, looking for disturbances in the water’s surface or a more direct visual indication of fish. When they locate a likely area, which can easily be as big as 500 meters on a side, they patrol it back and forth, like mowing a lawn, or in lazy circles. On Elkhorn Slough they will find a spot of open water and work back and forth. They often hunt in small groups.

When seasonal schools of fish arrive in Monterey bay seabirds follow; cormorants, gulls, albatrosses, shearwaters, terns and pelicans. Each has their own hunting method and niche to fill.

One aspect of their hunting I was not aware of until I examined my images carefully is the rotation of their head as much as 180 degrees from the normal position as they strike the water. This enables them to keep prey in sight as they adjust the entry point up to the last millisecond, ensuring their beak is in the best position to trap the fish.

Unlike browns, their cousins the white pelicans are not dive feeders, they feed by cooperatively skimming small fish at the surface.

The birds on the left are feeding, with their heads under water.

Whites are not seabirds, they feed inland, in lakes more than on the ocean, although I do regularly see them in harbors, bays and estuaries. They are considerably larger than browns but everything is to scale so the size difference is hard to appreciate unless you are close, but they are more wary of humans. If you ever get close, notice their bright orange legs, they resemble tree trunks.

The textbook definition of tolerant.

The textbook definition of tolerant.

Both species are very elegant animals, but browns are friendlier, more acclimated to civilization, much more tolerant and willing to share space with us. They can be found in harbors, bays, at river mouths and the open coast. Roosting is done in familiar locations, where they feel safest. If you know where to look they are easy to find, provided food is plentiful in the area. They can fly hundreds of miles a day and will follow the life cycle of the small fish they eat, moving up and down the coast.

Hunting off Point Joe, a target is identified.

Followed by a very graceful and elegant pivot.

That morphs into a dive

Near final adjustments

Adjusting trajectory.

Striking the surface of the water, his head is rotated 180 degrees from the normal flight position.

He goes completely into the water.

A yearling hunting on Tomales bay. He drops his feet, raises the leading edge of his wings. They stall, he loses lift and falls.

This pelican is going somewhere in a hurry. On Tomales bay, north of Marshal.

A more shallow dive at Elkhorn Slough. Once off the ocean they must account for water depth, Elkhorn at low tide has acres of water less than a foot deep.

Advertisements

About westcoastwilds

This site is meant to share the beauty of the Pacific Ocean and educate people about mankind's stewardship obligations now that we have complete control of the planet. To date we've made a mess of it, but there is still hope.
This entry was posted in Pelican and tagged , , , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s