Hawks Fledging; Hummers Humming

This has been the week for birds! Every morning I am awakened with a symphony of bird song. The phoebes, nesting beneath my study window, spend their days hunting insects on the wing. And at the beginning of the week I was buzzed by a Ruby-throated hummingbird. It was a male, so bright he shimmered like a jewel. After buzzing my hat he perched on a fence post and eyed me. Determining my lack of nutritional value, he zipped over to the onions in flower (left in garden from fall) - I wonder what onion nectar tastes like?

Cornell Lab of Ornithology has a great collection of sounds. Here's some of the hummingbird sounds you can listen to: http://www.allaboutbirds.org/guide/ruby-throated_hummingbird/sounds

Meanwhile, the baby hawks have quickly grown into that gawky teenage stage where they're ready to go to the mall but not sure they want to sit in the driver's pilot's seat. This week looks like "fledge" week up at Cornell... on Monday one hawklet spent the afternoon standing on the edge of the ledge testing his wings. Like kids everywhere, when mom comes home from her errands, they try to snuggle under her wings! It's a tight fit, as you can see from this video:



By Wednesday two of the young hawks had tried out their wings. Today might be the day hawk chick #3 heads out for a test flight. What's going on in the lives of the birds outside your window?
Check out other STEM Friday posts here. 

Baby Birds Need Password for Supper

Juvenile superb fairy wren. (Wikimedia commons)

Like any other baby bird, fairy-wrens sing for their supper. But they have to go one step further and give mama bird a secret password before she hands over the worm. Not only do fairy-wren nestlings have passwords, but each family has a different password – a single unique note that nestlings incorporate into their begging calls.

And they learn this password before they’re born – while they are still in the egg. Mama birds sing to their eggs to teach them their special“feed me” song. The mama birds also teach their mate and any helpers the secret password as well.

Why? Because parasitic cuckoos sometimes lay their eggs in fairy-wren nests. Baby birds need lots of feeding, and cuckoos tend to be greedy, gobbling up the food when given a chance. So if a mama bird can tell which nestlings are her own, she can feed them – and not the imposter.

Each fairy-wren family has its own password, too; and it’s learned, not inherited. When scientists switched eggs (they put one mom’s eggs in another’s nest), the hatchlings sang the “feed me” song that matched their foster-mom, not their biological mom.

So next time you’re at the supper table and mom says, “what do you say?” – you’d better pay attention. Could be your family has a special password, too. Check out more cool news and resources at STEM Friday.

Checking in on the Hawk Chicks

They are chicks no more. After a month of pigeon take-out and chipmunk meals they’ve grown nearly as big as their parents. They’re jumping up and down, stretching their wings, and wandering to the edge of the nest platform as if checking out potential flight plans. These guys look restless and ready to go. Drop by the nest cam and check out the adolescent “I can’t wait to get out of here” hawks.