SOUTH NEWFANE — I watched as my friend scattered corn for the family of Canada Geese. There was Mom and Dad and five goslings already approaching their parents in size. Jokingly and flippantly, I said something like: “Fattening up the tender goslings for your Christmas dinner.”
He shot me daggers!
He did not think that what I said was the least bit funny. This pair of geese returned year after year to his farm pond. They were dearly loved pets, and you don't joke about dining on your pets.
In half a dozen places around our county, I have seen homemade roadside signs cautioning drivers about a goose crossing, usually with a graphic of parent geese leading their line of young.
Young goslings are admittedly very cute. It is almost impossible not to say “Ahhh, aren't they adorable” when you see them scrambling after an adult goose.
The protective attentiveness of parent geese to their young is commendable and very effective. If you don't pay too close attention, goose parenting could provide fodder for the family-values moralists.
But if you do pay attention, you might ask why a pair of geese are protecting a dozen or more goslings when they normally lay only six eggs.
A couple of years ago, I watched two adult geese leading 23 goslings in the Retreat Meadows; I was able to count the moving number when I had my photograph on the monitor so that the birds stayed still.
Behind that group came another pair of adults leading 16 youngsters. These were only two of the gosling collections scattered around those waters.
Canada Geese have become so common that I could elicit many reports of geese families that disappear from small ponds, or from the larger ponds and bogs that host several grazing families and many goslings.
A friend on Newfane Hill wondered why the nesting geese and all of their recently hatched young disappear a few days after hatching. Did snapping turtles grab all of the young, leaving the adults to fly off? Or is something else happening?
A farm pond in Brookline has one nesting pair of geese, but through the summer, several families use the pond and farm fields to raise their young. Where did the other families come from?
So what's happening?
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The Canada Goose (she is a goose, he is a gander) lays a big egg - about 3 inches in length. Physiologically, she is designed to incubate six eggs. If there are more than six eggs in a nest, it might be due to another goose having dumped an egg in her nest.
The large, nutrient rich eggs of the Canada Goose result in “precocial” hatchlings - that is, they are relatively well-developed, have a thick coat of natal down, and are able to feed themselves almost immediately.
By contrast, songbird hatchlings are altricial - helpless, naked, eyes closed, and totally dependent upon their parents. Parenting of altricial young is hard work.
The parenting of a dozen precocial young goslings is relatively easy, since they can feed themselves. Parents show their young what to eat and watch out for dangers. But a typical clutch of eggs is only six. What's going on in goose society?
As he writes in The Geese of Beaver Bog, Bernd Heinrich noticed that his pair of Canada Geese disappeared with their six hatchlings after only a couple of days. Curious, observant, tenacious (he made notes for several years) and a little lucky, he discovered that his pair led their hatchlings through the woods to another larger pond with good grazing fields where they joined the resident breeders of that pond. The new pond was about three miles from his beaver bog. Other pairs also came to the new pond.
At the new pond, other goose dynamics took over.
The six goslings of Heinrich's pair were adopted by the resident geese, and his pair returned to his beaver bog. They stayed for a while, then probably flew north to Québec, where they joined other geese on a “molting” territory, where numbers and remoteness would protect them during their summer feather molt, when they are unable to fly.
Meanwhile, the resident pair successfully protected their own six goslings and their six adopted goslings - this, in spite of the fact that their favorite grazing field was also the home of a red fox. The ever-alert gander warned off the red fox, and the fox wisely decided not to challenge the gander's powerful beak or wings.
Hatchling geese imprint on what they first see and follow that form. Hence, when they see their parents at hatching, they imprint on them and follow them through the woods.
But it seems that imprinting on specific individuals of that form takes place a few days later. If young geese are in the presence of other adults, they may imprint on those adults, rather than their hatch parents.
Since all they need is some protection and leadership, it is not a big burden for geese to become adoptive parents. They can guard a dozen as easily as they can guard half a dozen - or, given what I saw in the Retreat Meadows, two dozen.
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But why do these adoptions occur in the first place? One would think that the parents would have a genetic self interest in staying with and protecting their own offspring.
There are probably several explanations, but protecting turf from outsiders seems to be one factor.
John Anderson has been watching the resident geese on Sunset Lake for many years. A few years ago, two pair nested and hatched young. Not long after the hatching, he watched the resident gander attack the second gander, who had had the gall to intrude on his lake.
He saw not a wing-flapping, goose-hissing confrontation, but an out-and-out physical fight. The second pair of adults left, and the resident pair adopted their goslings.
Canada Geese are long-lived, with a lifespan of perhaps 20 or more years. They usually begin breeding in their third year and have a strong fidelity to their nesting territory, returning to the same place year after year. If they have friendly human neighbors, they will establish neighborly relations.
A friend has scattered corn for the resident pair at his camp for many years. One summer, he got a new truck. The next spring, when the road finally opened, he drove in to the camp. He saw a pair of geese at one end of the lake. By the time he got to his camp halfway down the small lake, the pair was waiting for him and his corn. They not only remembered him, they also remembered his new truck.
Canada Geese have become so familiar that it is easy to overlook their fascinating complexity. They have society and culture, loves and hates, just as we do.
Good birding!