In quieter Mexico City, rare bats are surfacing
MEXICO CITY — At a Mexico City university campus, researchers are stringing mesh nets between trees, hoping to capture evidence that a rare bat has begun visiting its favorite plants in this metropolis of 9 million.
The National Autonomous University’s botanical gardens are filled with flowering morning glory, agave plants and cactuses that provide the bats with food; their long tongues and noses have evolved to drink nectar from the blooms.
The protected Mexican long-tongued bat was first sighted this year in an even more unlikely location: a zoo at the Chapultepec park in the city’s center. Under pandemic rules, the park was closed or placed under strict visitation limits for much of the past year, and that may have encouraged the bats to come and feast.
“It is clear that we have seen that, as human activity declined in the city, wild animals have begun to retake the city,” said Rodrigo Medellín, a biologist at the university’s Ecology Institute.
As people across the globe stay home to stop the spread of the coronavirus, animals have been venturing into places they aren’t usually seen. Coyotes have meandered along downtown Chicago’s Michigan Avenue and near San Francisco’s Golden Gate Bridge. A puma roamed the streets of Santiago, Chile. Goats took over a town in Wales. In India, already daring wildlife has become bolder with hungry monkeys entering homes and opening refrigerators to look for food.
As night began to fall in the botanical garden in Mexico City, a shout rang out among the researchers. “We got one!”
With carefully gloved hands, a student began to take the tiny, 4-inch animal out of the net. It could fit in the palm of one hand. Mr. Medellín was certain as soon as he saw it: It’s a long-tongued bat, distinguishable by the elongated tip of its nose.
“I never would have thought it,” he said of seeing the bat in Mexico City. Listed as threatened in 1994, the bat normally lives in dry forests and deserts, in a range that extends from the southwestern United States to Central America.
But it’s not clear whether the long-tongued bat has begun recolonizing Mexico City, or whether the bats are visiting now when its favorite plants are in bloom. Key facts such as the bats’ migration patterns, or how far they fly, remain unclear.
Once the tiny bat was freed from the net, one researcher rubbed the its wings, back, nose and head with a small cube of gelatin, to pick up and preserve possible samples of pollen, to determine what plants the bat has been visiting.
The bat also got a small dose of sugar water from a syringe, to help it recover from the stress and help obtain stool samples that can shed further light on its diet.
Finally, a tiny microchip the size of a grain of rice was inserted into the animal’s back, to help track its movements.