The tree's survival depends largely on certain bird species to eat and disperse seed. But in the broken parcels with few trees left, the birds were rare or absent.

An international group of researchers recently developed a tree based on the full genomes of 48 species, representing every major bird lineage—the most thorough genetic study of a large branch ...

I regard the bird-tree connection as commensal symbiosis. Nature Talk Monthly nature programs at Loveland Public Library, 300 N. Adams Ave., continue in the Gertrude Scott Room.