Tuesday, November 16, 2010

what birds eat part II

Female Cardinal . . . where you been?
                                           Photo by Russ Norwood www.perceptivist.com




“Hey me
Hey mama
Where you been?
For so long, For so long?”

                           – Ray LaMontagne
                                             from “Hey Me, Hey Mama”


Blogger note: Besides a couple of photos by long-time naturalist buddy Beth Erwin (curator, Kalorama Nature Preserve, Collinston, LA) and myself, this post features the ultra-fine pics of Baton Rouge ad-man and nature photographer, Russ Norwood. Check out www.perceptivist.com!

     It happens every autumn in backyards all across . . . America? The world? I dunno. All across Louisiana, I know for sure – including here around Lafayette – beginning generally around mid-October (although this fall, not until the first week of November), and usually persisting for the next 6-8 weeks . . . one minute, it's birds galore; and the next minute, BAM! Gone.

     The sudden disappearance of birds – cardinals, chickadees, titmice, mourning doves, woodpeckers, blue jays, chickadees, titmice, cardinals, house finches, etc. in our case – that otherwise spend each and every day crowded around the feeders in one's backyard is dramatic, to say the least. Dramatic enough to be noted by even the most lackadaisical of backyard bird folks.

     So what's the deal? Where have all the birdies gone, long time passing?

     Apparently, no human knows for sure, but conventional wisdom says that backyard birds disappear each fall in response to the ripening of that year's crop of wild seed. Makes sense. Why stick around for stale, non-diverse, store-bought seed when there's a fresh supply of way-diverse wild seed hanging so tantalizingly off of plants just a few wingbeats away? I mean, a bird can return to the ol' seed trough anytime he/she wants; so why not go for the good stuff while the getting's so good?

     Regarding The Great Departure here in the pseudo-wilds of upper Lafayette parish, the backyard silence becomes deafening. Like, wow, so this is what 'quiet' really sounds like, huh? After only about a week or so, though, the chickadees slink back . . . followed a week or so later by the titmice. Apparently, these two species quickly run out of whatever wild stuff out there that happens to trump good ol' black-oil sunflower seeds.

     Of course chickadees and titmice eat far more than black-oil sunflower seeds – all manner of tiny insects, insect eggs, insect larvae, etc. – regardless, they come crawling back home in pretty short order.

Male Cardinal, Kalorama Nature Preserve, Morehouse Parish, LA
photo by Beth Erwin


     The doves, cardinals, and house finches, on the other hand, stay gone the longest; apparently finding far more in the way of wild quality and quantity than do the chickadees and titmice. In the interim, what few cardinals we do notice back in the yard are coming back for water, not seed. Also, we note several of the youngest cardinals sneaking back in each dusk, obviously interested in the safer roost sites they grew up with here around the homestead.

Blue Grosbeak munchin' wild rice at Avery Island 19April2009
                                           photo by Russ Norwood www.perceptivist.com



     Ah, birds and their seeds. So inspiring. What precious little a bird needs to sustain itself, you know? Like, a few grams' worth of seed each day. St. Francis of Assisi (himself known as il povrello, the poor one) spoke of the inspiration that birds provide a person who's looking to live a more simple life.

Field Sparrow, Morehouse Parish, LA 06Nov2010
                      that little hint of a tuft hanging on its bill is leftover little bluestem grass seed
                                                              photo by Beth Erwin


Swamp Sparrow chomping the paint-brush-like seed of boneset (Eupatorium spp.)
                                           photo by Russ Norwood www.perceptivist.com


     I remember the first time witnessing swamp sparrows and American goldfinches devouring goldenrod seed. Tethered to a silken-chute far larger than itself, a goldenrod seed is too tiny for most humans to see or even feel. To a big ol' human, it's just totally amazing that a bird would even bother with it; but bother with it, they do. . .

     Of course most bird species do not limit themselves to a seed-only diet, since seeds are by no means year-round food items out in the wild, particularly up here in the temperate zone. As previously mentioned, small woodland birds such as woodpeckers, chickadees, titmice, and warblers are near-perpetual insect eaters, collectively rummaging through forests like a fine-toothed comb, relieving trees of the bulk of the leaf-eating stem-sucking bugs that annually infest them. What would our forests look like without these little birds? Would we even have forests to look at without them? Legendary wildlife conservationist Aldo Leopold (you must read A Sand County Almanac if you haven't already done so . . . in fact, if you've already done so, then read it again) wrote, “The last word in ignorance is the man who says of an animal, 'What good is it'?”

     As little as humankind thinks of or about tiny, insectivorous birds, would it not be ironic if we were to discover that it is tiny, insectivorous birds which are actually in charge of maintaining the health of the planet's forests? Or at very least, the primary care-givers to the forests?

     One day my buddy Neal Walker called to report that cedar waxwings (probably the most frugivorous of all North American bird species) were picking off aphids who were attracted to the new spring growth of a river birch outside of his kitchen window.

Cedar Waxwings devouring newly emerging blooms of green ash: “spring greens”
                                                         Baton Rouge, LA 12April2009
                                            photo by Russ Norwood www.perceptivist.com

     And it doesn't stop there. Students of bird nutrition soon learn that in their relentless search for calories, it's amazing what some birds gain sustenance from. In early spring, obvious fruit eaters like cedar waxwings, along with such dedicated seed eaters like white-throated sparrows and American goldfinches, can all be seen “getting their spring greens” from newly-sprouted flowers, samaras, etc. of deciduous trees.

Winged Elm samaras (Ulmus alata)...excellent February food for Louisiana sparrows and finches

Baby Common Moorhen learning the joys of duckweed
                                                        Lake Martin, LA 10June2006
                                           photo by Russ Norwood www.perceptivist.com

Prothonotary Warbler, a dedicated insectivore if there ever was one, making off with a black cherry fruit
                           Sherburne Wildlife Management Area, Iberville Parish, LA 15June2008
                                           photo by Russ Norwood www.perceptivist.com

     Obviously, such items are packed not only with calories, but also with minerals and other micro-nutrients that these birds cannot easily procure in their normal fare. Got to get it, Papa!

1 comment:

  1. This is wonderful, and outstanding photos. I've never seen a prothonotary eat a black cherry, just swamp privet. And the moorhens! We don't have those around Missouri...Thanks so much.

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