Goldfinch baby food

American Goldfinch: a Common Bird with Uncommon…

July 21st, 2017 by Barbara Mackay The Outside Story

Illustration by Adelaide Tyrol

I love the fact that there is always something new to observe in nature. Take goldfinches, for example. I have often watched them devour milkweed seeds from an acrobatic, upside-down position. Recently, I spotted several bright yellow males perched atop dandelion stems, plucking the seedheads at a frenzied pace. Previously, I had only seen them snag dandelions in mid-air.

Of all our native songbirds, American goldfinches (Spinus tristis) are perhaps the most consistent vegetarians. Thistles are a favorite food source and nest material. Sunflower seeds are another top meal choice, something you have probably observed if you offer these popular seeds in a feeder. Aside from our freebies, goldfinches also eat seeds from grasses, weeds, teasel, mullein, and ragweed, along with birch and alder buds, maple sap, and berries. An uncommon agility allows them to extract seeds from any position. Their short, pointed, conical bills are well-suited to crack open hulls and other tough packaging.

Goldfinches feed their newborn broods a strict diet of regurgitated seeds rather than high-protein insects or a mix of seeds and insects favored by other passerine (perching) birds. Coincidentally, this habit offers a distinct advantage against an occasional parasite, the cowbird. Cowbirds are known for depositing their eggs in other birds’ nests, where the large cowbird nestling often receives an unfair share of food from the unsuspecting parent, risking starvation for the other chicks. But baby cowbirds can’t survive off seeds, and a cowbird hatchling in a goldfinch nest is doomed.

Vegetarianism also influences nesting time. From the earliest red-winged blackbird to the last of the common yellowthroats, migrating birds generally get right to the business of establishing territories, building nests and raising young as soon as they reach their breeding grounds. This is especially true for those that double- or triple-brood. Like other songbirds, goldfinches pair up in the spring, but they wait until thistles, milkweeds, and other wildflowers start going to seed in summer to breed and nest. At this time, each male selects his own territory, flying in circles around an open area dense with weeds and shrubs, preferably near a water source (even a reliable roadside ditch will do). Warbling from a high perch, he defends his area by chasing other males away. His mate selects a suitable site for a nest and constructs it over four to six days while he helps by gathering material.

A goldfinch nest can be hard to find amid summer foliage, but it’s easy to identify. Look for a sturdy, cup-shaped nest built into the fork of a branch in a sapling or large bush. Small twigs, bark strips, and long plant fibers form the outside, which measures close to three inches across. Spider web silk acts as a glue to hold it together. The inside cup is deep, smooth, round, and firm. It is lined with catkins, bits of wool, and so much thistle and milkweed or cattail down that the pale, bluish-white eggs are almost hidden. Eventually the down becomes compacted during incubation and as the hatched chicks shift around. The nest is so tightly woven that it can fill up in a deluge of rain, sometimes drowning its inhabitants.

One clue to identifying a goldfinch nest is its characteristic squalor. Unlike other birds, goldfinches stop removing fecal sacs after the babies become active, about a week after hatching. Instinctively perhaps, the chicks begin to defecate along the edge of the nest. The nestling period lasts from 11-17 days, and there are usually five chicks, so you can imagine the buildup of dried waste. Hygiene aside, the durable nest maintains its shape well, still looking re-usable in midwinter. The thistle down gives it a cozy, cottony appearance.

Most songbirds completely replace their feathers once a year, commonly before fall migration. The summer feathers are gradually pushed out by a more subdued winter plumage. The following spring, a partial molt results in the attractive colors that enhance courtship. Male goldfinches become canary yellow with a black cap and black wings, each marked with a white wing bar. Females become a soft yellowish green with yellow belly feathers. Both sexes’ bills, legs, and feet change from dark brown to a soft pink-orange-yellow color.

Unlike most birds, goldfinches do not continue to defend a territory once a family is started, and members of a flock move freely in and out of each other’s areas. They are social birds, flocking together in winter and amicably sharing bird feeders at any time. This time of year, see if you can spot one gathering seeds and fluff in the milkweed patch.

by Barbara Mackay

Barbara Mackay is a teacher and naturalist who lives in northern Vermont.

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How to Feed an American Goldfinch Baby Bird

By Carrie Terry | Updated September 26, 2017

Things You'll Need

Bowl
Tissue
Heating pad/lamp
Large box
Dog/cat food
Water
Hard-boiled egg yolk
Baby cereal
Baby spoon
Cage
Branches/perch
Dish

Goldfinches generally nest in May or June on the West Coast and lay eggs soon after the nest is built. Eggs hatch after 12 to 14 days, and the babies generally leave the nest 11 to 15 days later. In the time between hatching and leaving, the nestlings are vulnerable and must be fed by their parents. If you have found baby goldfinches that you know have been abandoned and aren't able to care for themselves, spend a couple of weeks feeding them, then release them into the wild.

Set up a substitute nest for the baby. Put wadded tissues in a bowl or berry basket to provide warmth, comfort and security for the baby goldfinch. Make sure the tissues are tight enough around the baby to support its body. Turn on a heating pad or lamp and set it near your nest to keep the baby goldfinch warm. Never put the baby in direct sunlight. Place the bowl in a larger box to keep it safe.

Soak dog or cat food and baby food in warm water. Supplement this with mashed hard-boiled egg yolk. Allow the mixture to sit until it has become a mash.

Put small amounts of this mixture in the baby's mouth when it opens it, using a baby spoon. Baby birds open their mouths wide and gaping, to make them more accessible. Place the food in the back of the baby bird's mouth, and wait for it to swallow before repeating. Never put liquid directly into the baby's mouth; the consistency of the food should always be that of a mash. Feed the baby every 30 to 60 minutes during the day.

Move the baby goldfinch to a cage environment when it starts growing feathers. Put sticks, branches and perches in the cage so the baby has a platform from which to jump and fly.

Put fruit, nuts, seeds, and vegetables into the bottom of the cage at this point, along with a dish of water. Maintain hand feedings, but restrict them to every 60 minutes, and then every two hours, and on, to encourage the bird to start eating and drinking for itself. Gradually wean the baby birds away from the hand-feedings in this manner.

Release the bird when it's able to eat and fly alone. Take it outside and place it on a fence or tree to begin its wild life.

Goldfinches can grow to be 5 inches in length. Male goldfinches are bright yellow with black caps, wings and tails; females are yellowish green.

Warnings

Worms can carry parasites and should never be fed to baby birds. Keeping some breeds of bird is illegal.

References

Wild Bird Watching: Baby Birds--Should I Help?
American Bird Watching: American Goldfinch Habits

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