Geese use loud invitation calls to recruit passing flocks into an established marsh

Evidence

Once the first geese are in, they honk a clamorous invitation to each migrating flock, and in a few days the marsh is full of them. On our farm we measure the amplitude of our spring by two yardsticks: the number of pines planted, and the number of geese that stop. Our record is 642 geese counted in on 11 April 1946. — Aldo Leopold, A Sand County Almanac, 87

Categorization

• SHARE: The idea of measuring spring’s ‘amplitude’ by geese counted and pines planted is a practice a phenology-obsessed friend would treasure.
• XREF: Direct method for nature-interpretation-as-pedagogy in ECST 3980 — measuring a season by two invented yardsticks. — connects to: Migrating geese alter their routes and habits according to local hunting laws — Aldo Leopold, A Sand County Almanac: With Other…, 84