JWM: Are black brant numbers going up — or down?
To judge by the annual surveys, black brant (Branta bernicla nigricans) are on the upswing. After years of decline, aerial counts along their migration routes — ...
Mexico
Translocated Nevada hawk moves on to Mexico
As a Wildlife Services airport biologist working at Naval Air Station Fallon in Nevada, I recently heard from an enthusiastic birder, Tony Thacker, who had spotted ...
Watch: Tracking the monarchs to Mexico
Before the 1970s, where monarch butterflies overwintered was a mystery. Then researchers succeeded worked with Mexicans to trace the migration to the hills of ...
Monarch butterflies increase dramatically in Mexico
Monarch butterflies (Danaus plexippus), which have been steeply declining throughout their range, showed a significant increase in their overwintering areas in ...
Recolonizing Florida monarchs face steep decline
Monarch butterflies (Danaus plexippus) stopping over in Florida while traveling north have declined 80 percent since 2005, according to a new study. The monarchs ...
Study maps ‘climate corridors’ for shifting species
As climate change impacts ecosystems around the world, wildlife managers are expecting to see many species leave their current ranges for new areas better suited to ...
Scientists warn border wall would harm region’s species
A continuous border wall between the United States and Mexico would cause trouble for the biodiversity of 1,506 native terrestrial and freshwater animal and plant ...
Climate and landscape changes shifting Texas bats’ migration
Climate and land use changes are altering bat migration in Texas, researchers found. Studying the world’s largest migrant bat colony, they discovered that the ...
Can a ‘twitch’ be a pitch for wildlife?
The black-backed oriole typically subsists on monarch butterflies in the forests of central Mexico, but when one appeared in suburban Pennsylvania last January, ...
Border wall could harm endangered animals
Biologists are worried that a border wall would cut off dozens of species that migrate between Mexico and the United States. Penn State University biologist Jesse ...