Texas

Energy and Environment Reporting for Texas

A Tale of Fledgling Birds, Invasive Species and Climate Change

Photo by Mose Buchele

A fledgling mockingbird seeks refuge in a tomato plant in Austin, Texas.

It’s a story familiar to pet owners.

About a week ago, I was watering our small raised garden when I noticed two baby mockingbirds hanging out in the tomato plants. There was a grown bird nearby, watching its offspring and chattering angrily at me. I didn’t think much of it until later, when I heard my wife scolding our dogs in the front yard. Eddie and Bobo, our fawn pugs, had found one of the baby birds and decided it was play time.

They played rough. A little too rough.

As I buried the fledgling, I got to thinking: is this happening in front yards all across the state? Even all across the country?

One bird expert says, pretty much, yes.

“There’s a critical time when these birds hatch, and there’s a period of anywhere from a week to three weeks, when they’re going to be learning to fly and to fledge, and that’s the danger zone,” Barry Lyon, who serves on the board of directors with the Travis County Audubon society, told me.

Mose Buchele

The Culprits: Household pets pose a great risk to wild birds. Cats are believed to kill billions of birds annually, sometimes dogs, like Eddie (left) and Bobo (right), cause harm as well.

It’s not marauding pugs that usually pose that danger. Much of the time it’s cats.

“Yeah, this is a very contentious issue. Extremely contentious,” Lyon said, choosing his words carefully. “People love their cats. People love cats as much as anything … [but] house cats are a non-native animal within the environment of the Western World.”

That means cats have few natural predators. Yet they are predators themselves, and birds are among their favorite meals. Some estimates say house cats kill nearly 4 billion birds each year in the US.

So what can you do if you find a bird in your yard and fear for its safety? Lyon says it’s a judgment call.

“A lot of people like to, you know, go ahead and pick it up and put it back in the branches,” Lyon said.

Like a lot of people, I had always thought that a mother bird would reject her nestling if it was touched by a human. Turns out that’s a myth, according to Jason Martin, a project leader at the Cornell Lab of Ornithology.

“Most birds actually have a poor senses of smell. So you will not be leaving your scent on a bird if you touch it,” Martin told me.

That doesn’t mean it’s usually a good idea to pick a bird up just to put it out of harms way. Martin and Lyon say that should only be an option when the bird appears too young to be away from its nest.  Older, fledgling birds often leave their nests and spend a few days on the ground, still fed by their parents, before they learn to fly.

“And if you try and pick up the bird and put it back in the nest again, chances are it’s just going to jump out again,” Martin said.

Barry Lyon serves on the Board of Directors of the Travis County Audubon Society.

Experts say there are other things you can do to help, including growing native plants that provide plenty of cover and, of course, keeping your cats inside when you know there are birds underfoot.

Why might someone try to give a small bird a helping hand? For one thing, the odds are against them. Mortality rates among some bird species before reaching adulthood reaches 70 percent or higher.

Then there’s the threat of global climate change.

Experts also say certain species of birds are gradually changing their native range because of warming trends.

“This is the kind of thing that can be gradual, barely perceptible, or it can be very perceptible,” Lyon said. “Some of the species are inching northward, like birds that occur in the southwestern United States.”

He said the White Winged Dove and Great Tailed Grackle are both examples of bird with ranges expanding to the North.

As for our yard, we’ve learned to keep Eddie and Bobo under close watch while the birds are still learning to fly.

Comments

  • Greg

    I can’t believe Mocking birds have made it this far through evolution – have you noticed how low to the ground they build their nests? and there have always been plenty of indigenous bird predators in the US.

    • Rose

      Perhaps that is why mockingbirds protect their young so aggressively. Cats form an unusually high predator to prey ratio. If you look at an average neighborhood, there can be forty or more cat in a one block area. No bird can survive odds like that. In addition, when I rehabilitated wildlife, over 50% of the wildlife I admitted were attacked by cats. Cats carry the bacteria Pasteurella in their mouths, which is generally fatal to small birds and mammals.

  • llida

    All domestic pets should be managed responsibly, and that means either indoors, on your own property or under voice command on public land. If a fledgling or new-born wildlife is encountered, keep your pets away. As far as cats, they should follow the same rules: making cats the exception produces a list of harm that is much longer than the positive benefits.

  • http://www.sanderson.co.nz/Artist/139/Paul-Martinson.aspx Paul Martinson

    domestic cats were created by humans as companion animals. They belong with humans indoors. When outdoors ….they kill and harass other species in a non discriminatory way….and often just for the sake of it. Without any natural predators upon themselves ….cats ultimately destroy a natural environment by reducing biodiversity. In New Zealand, domestic cats have caused the extinction of the unique Lyall’s wren (the only flightless wren known) and have contributed to the extinction of another 20 species of bird.

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