Starling flocks are disappearing, Christmas Bird Count numbers show

Birders across the city reported seeing fewerstarlings and pretty much every other bird during the 96th Christmas Bird Count.

Dozens of bird lovers flocked together across the city on Boxing Day for the annual tally put on by the Hamilton Naturalists' Club, and noticed a consistent decrease in populations all around.

"We might have close to the 30,000 we had last year as this trend continues, perhaps even less," said Rob Porter, head of field events with the Hamilton Naturalists' Club and Digital Naturalist.

Invasive species in decline

The bird count provides data from thousands of groups worldwide, informing future studies and research for the National Audobon Society in the U.S., and Bird Studies Canada.

"It's a single snapshot in a single day of a single year," said Porter."But there has definitely been a trend in fewer species every year for a while now."

This year, the big surprise was a serious decline in Hamilton'sstarling population. The invasive species, which in the 1980s or 90s used to be tens of thousands strong here, has been in serious decline.

"The flocks aren't really around anymore," said Porter, though the answer why is unclear.

"Is it indicative of predators balancing things off finally, or is there something they're eating that isn't good for them? Certainly we're seeing magnitudes less."

• Happy Hamilton bird-watchers spot species usually long-gone

Uncommon findings across the city

This year, despite the highest temperature on records and a rainy forecast, birderssaw a number of rare feathered friends, including a tufted titmouse and an orange-crowned warbler.

"This was a weird year," said Porter, remarking on the Boxing Day record high of 11.5 C. Unfortunately for the bird count, the rain was no surprise.

"Our count is kind of unlucky in that in the last 20 years, we've only had two days of sun, and they were both in a row in 2004 and 2005."

But the rainy day still brought around 90 people outto see such uncommon birds as a northern goshawk, which hasn't been spotted in the area since 2011. Birders spottedthe red-wingedblackbird at Cootes Paradise, as well as one alone in downtown Hamilton.

"Most years we get one, maybe two, but someone reported seeing a whole flock of 10," said Porter.

Other Canadian communities have struggled with how to control starling populations in recent years. In 2013, municipalities in Okanagan, B.C., rounded up 500,000 of the invasive birds and killed them because of their impact on farmers' fruit trees.