High-altitude migrants
Bar-headed geese cross the Himalayas on migration. GPS tracking places them above 7,000 metres, where the air holds little oxygen and flight becomes hard work.
Goose facts
The bird has a point
A goose in a parking lot looks ridiculous until you remember what it can do. The same bird can cross mountain ranges, raise young in the open, read terrain, and remember who got too close to the nest.
HONK, with citations.
Field marks
Canada geese deserve a second look
Cities build open lawns near water. Geese use them. Nesting season turns vague boundaries into clear standoffs. Honk. Flight demands cooperation, so a flock shares the hard work at the front.
Formation cooperation
A V-formation lets trailing birds use lift from the bird ahead. Flying in front burns energy, so the lead changes in the air.
Family security detail
Canada geese often form long pair bonds. Both parents defend the young. On the water, goslings often travel between the adults.
One-eye watch
Half a goose brain can stay awake while the other half sleeps. This neurological split helps a resting bird keep one eye open, still scanning for threats.
Better color worlds
Bird vision extends into the ultraviolet spectrum. A goose sees parts of the park that humans miss.
Accidental gardeners
Geese move seeds as they graze and travel. At moderate numbers, they help with seed dispersal and nutrient movement.
Sources
Useful goose reading
Environment and Climate Change Canada on goose conflicts
Information on nest defense, urban adaptation, and conflict with humans.
Open sourceDucks Unlimited Canada Goose ID
A practical guide to markings, range, habitat, and flight profile.
Open sourceCornell Lab of Ornithology on Canada Goose behavior
Covers vocalizations, V-formations, foraging, and urban lawn use.
Open sourceCornell Lab of Ornithology on Canada Goose life history
Data on pair bonds, family groups, nesting, and territorial defense.
Open sourceCanada goose management handbook
Why open, maintained green spaces provide good habitat for molting geese.
Open sourceBar-headed goose high-altitude physiology
The biology behind sustained flight through low-oxygen Himalayan air.
Open sourceTracked Himalayan migration in bar-headed geese
Satellite data on flight paths and altitudes above 7,000 metres.
Open sourceBird UV vision review
Research on avian cone photoreceptors and ultraviolet vision.
Open sourceGoose seed dispersal study
Tracks greylag geese moving seeds between agricultural fields and wetlands.
Open source