Migratory birds and pigeons, snakes and bees are causing headaches for airlines in Philippines.
Five domestic flights and 2 international flight of Philippine Airlines were affected by the closure of the aero bridges.
It appears that last January, the Airline Operators Council complained to the Manila International Airport Authority about the worsening problem of birds flying into planes.
Alex Cariaga, head of the airport's ground operations safety division, said there had been 23 incidents in which birds were sucked up into jet engines last year.
The so-called "bird strikes", which could cause a plane to crash, was up from just nine in 2009, Cariaga told Agence France-Presse
However there had been no major incident yet due to the bird strikes.
Cariaga said the problem appeared to worsen after developers reclaimed some small lagoons near the airport runway last year to build warehouses.
"We thought it was a good thing because we expected the birds to move elsewhere," he said.
However the birds, mainly egrets, instead moved to the grassy areas beside the runway to hunt frogs, grasshoppers, lizards and other prey.
Apart from the migratory birds, Cariaga said the team also had to deal with domesticated pigeons that were raised by surrounding communities.
Source: ABS-CBN News