These birds may look like fiesta buntings or Christmas lights at night, but can be totally annoying once they start raining the streets of Batangas City with their droppings. FLORANTE CRUZ/CONTRIBUTOR
These little birds do not come just in dozens, but in hundreds of thousands, and not everyone鈥檚 quite happy about Batangas City鈥檚 frequent visitors.
Especially unhappy is the city鈥檚 general services office which is tasked with cleaning up the bird droppings off the streets and sidewalks.
Thrice a week, the city government sends out a fire truck and about 20 men to water spray and brush away the birds鈥� stains with organic disinfectants.
The Batangas city environment and natural resources office (Cenro) spends about P4,000 every two days to clean up the 1-kilometer P. Burgos Street, a busy commercial thoroughfare, which has become a favorite roost of the barn swallows.
Locally referred to as layang layang, barn swallows (Hirundo rustica) are migratory bird species known for traveling long distances to tropical areas like the Philippines to escape winter.
Batangas city environment officer Oliver Gonzales said they started seeing flocks of swallows along P. Burgos in 2010.
鈥淲e noticed that they were nowhere in sight weeks before (Typhoon) 鈥淕lenda鈥� (in July 2014). We thought they were gone for good. But after the typhoon, they were there again and even increased in number,鈥� Gonzales said in a phone interview on Tuesday.
Cenro estimates about 250,000 swallows swarming the city every season.
To address the swallow problem, the city government consulted the University of the Philippines Los Ba帽os Museum of Natural History (MNH) and the School of Environmental Science and Management (Sesam), which in November conducted a one-week study on the swallow phenomenon.
The team, composed of MNH bird curator Dr. Juan Carlos Gonzalez and university extension specialist Florante Cruz and Sesam鈥檚 Dr. Ma. Victoria Espaldon and Cheamson Garret Boongaling, conducted a survey of managers and proprietors of 85 percent of the establishments located along P. Burgos.
Their report was presented during the East Asian-Australasian Flyway Congress in December 2014 and was published on Jan. 22.
According to Cruz, the 鈥渦rban roosting phenomenon鈥� in Batangas occurs during the months of November to March, with thousands of the brownish birds, each the size of an average human hand, are seen perched along power lines, posts, trees and buildings.
鈥淵ou鈥檒l observe them from 6 p.m. and throughout the night. By morning, they鈥檒l fly away to find food and return by dusk,鈥� he said in a phone interview.
While 鈥渃ute鈥� to look at, Cruz observed residents propping up umbrellas or scurrying into buildings to protect themselves from the 鈥渄ownpour鈥� of bird droppings.
Gonzales said aside from making the street slippery, the droppings also leave a bad smell on sidewalks and car windshields.
Most survey respondents felt that the swallow phenomenon has no direct effect on the businesses 鈥渁nd that there is already a degree of tolerance (for the birds),鈥� MNH鈥檚 Gonzalez said in a statement.
However, he said, most people were unaware that birds carry fleas and gnats 鈥渨hich can cause human disease鈥� while only 20 percent understood that migratory birds actually come from other countries.
Cruz said the urban roosting opens up a lot more issues on environmental management.
鈥淐ould it be that the natural roosts of these voracious insect-eaters are so degraded that they are now thriving in the cities?鈥� Or how 鈥渉ave they become accustomed to loud noises and (human) population?鈥� he asked.
In other countries, Cruz said the birds are being poisoned to address a similar problem 鈥渂ut of course we do not do that here.鈥�
Gonzales said while they saw no solution yet to the bird droppings, the swallow phenomenon would be part of the environmental code that Batangas City and Sesam is currently drawing up.
In the meantime, he said they were working to promote P. Burgos as a bird-watching spot to draw tourists to their city.
鈥淲e cannot drive them away. In fact, we prohibit catching or killing the birds,鈥� Gonzales said.
He said their seemingly ungrateful guests have already been a part of their community. 鈥淢aybe they like it here because it鈥檚 not polluted. We鈥檙e just trying to look at it the positive way.鈥�