Along with a few smaller colonies,... the butterflies in these major colonies make up the entire breeding stock of monarchs for the eastern United States and Canada. ” Between 220 million and 270 million butterflies froze and fell from their tree roosts, covering the ground to a depth of more than a foot [30 cm] in some places.
No šīm un vēl dažām mazākām kolonijām.. ceļas visi Amerikas Savienoto Valstu un Kanādas austrumu daļas monarhtauriņi. ” 220 līdz 270 miljoni tauriņu nosala un nokrita no koku zariem, pārklājot zemi dažviet pat vairāk nekā 30 centimetru biezā kārtā.