Nesting Allen's Hummingbirds Spring 2019

This nest of Allen's hummingbirds are nearly ready to fledge.
These two little guys should take their first flights in the next 3-5 days.

It is hard for Cornell University to imagine, but this is our third nest of Allen's hummingbirds this 2019 season. (We enter data on our nesting birds in Cornell's NestWatch data base.) The first eggs were laid in a poorly placed nest in early January. That nest was completely soaked in a rain storm and failed. 

2nd nest with one chick

The second nest was established by a more experienced female and she was able to raise one chick to fledge on March 9th. The second egg never hatched. A record cold February may have played a role.

Another chick in a fourth nest hatched on March 16th, its sibling should hatch sometime today.

All of these Allen's hummingbird nests are in native hollyleaf cherry shrubs. The plant is slow growing. It's wide leaves are waxy to survive in hot dry summer temperatures and therefore provide protection when it does rain.

The first female, however, has taken a bold step and built her second nest under the protection of the patio. Anna's hummingbirds build nests on man-made objects fairly frequently. It is rather unusual for our Allen's hummingbirds. She has two eggs in her new nest.

This location should be protected from wind, rain, and even most predators. The biggest issue may be that when chicks first start to flap their wings, they won't have neighboring branches to flutter to. They won't be able to sidestep back to the nest. The location is also about 20 ft off the ground. That is a long way for a curious youngster to fall.
 
Have you lost count? In 2019, so far:

• 5 nests
• 1 successfully fledged Allen's hummingbird
• 4 chicks currently in nests
• 2 eggs still being incubated

Unexpected fluctuations in weather can cause nests to fail. Strong wind, pounding rain, cold snaps, can all take a toll on young hummingbirds. A rain storm is expected on Wednesday. Hopefully it will be lite. A heavy rain could make the first days of flying and survival without the protection of the nest a challenge for these youngsters.

The half siblings of these chicks from 2018 
Climate change and hummingbirds 

Are You Watching a Hummingbird Nest?

Allen's hummingbird female

It is the last day of April and we have four active Allen's hummingbird nests in our yard. (Selasphorus sasin)

Two nests have eggs. 

Allen's hum nest in butterfly bush

Allen's hum nest high in Catalina cherry

One is in an ornamental butterfly bush (Buddleja). This nest is awfully low to the ground and poorly covered by vegetation. It is not a good location and the female will need good fortune to be successful. Her chicks may be vulnerable if summer temperatures over 100 degrees come early.

The other is high in a native Catalina cherry shrub (Prunus illcifolia). This is an excellent location.

Allen's hum chicks, 10-15 days old

'Fairy Tree' nest with hum chicks

Two of the nests have chicks. The 'Fairy Tree' nest has already seen two chicks fledge in March. The female rebuilt the nest and these two should fledge toward the end of May. 

This mother is experienced and has used this Catalina cherry as a successful location in the past.

Allen's hum nest in toyon

The fourth nest is in a native toyon.  (Are you seeing a pattern? Native shrubs are more likely to house successful hummingbird nests.)

Native plants not only provide native insects as food, they also grow at a rate similar to the growth of the chicks. Nests in fast growing ornamental plants sometimes are torn apart by the growing plant. The chicks can become homeless before they are ready to fly.

These two chicks, yes there are two tucked in close together, should fledge soon.

These four mother Allen's hummingbirds are busy. This is the second nest of the year for each of them. Two were successful the first time and two were not.

So far in 2018 that's eight Allen's hummingbird nests in our yard. I monitor my hummingbird nests for NestWatch, part of Cornell University's Citizen Science bird data program. To date, my Allen's hummingbirds are the only nests where data has been collected on the reproduction of this species in 2018. 

I know there are more of you out there watching hummingbird nests. NestWatch needs your data. Successes and failures are equally important. This year we had eggs that shriveled and a chick that died when the weather turned from unusually warm back to cold winter weather. 

Early nesting attempts can lead to failure. This is the insidious impact of warming winter temperatures. Plants and animals take signals from the weather to begin reproduction. Record warm temperatures in January can lead to chick deaths when February brings a return to cold weather and rain.

How do I spot the nests? I watch the females:

• Females gathering nesting materials will fly right back to their building locations. I put out natural nesting materials.
• Females sitting in one place with their beak angled down and making an up-and-down movement with their head are most likely nest building or feeding chicks.
• Females catching small flying insects are typically craving protein because they are about to lay or have laid eggs or are gathering protein for newly hatched chicks. Watch where they go. 
• When eggs or chicks are present females typically do not fly directly to a nest. They fly to the home bush or tree, then make several short movements approaching the nest.

Several friends, especially those on the Pacific Coast hummingbird migratory path, have told me they are seeing far fewer hummingbirds. Data will help figure out if these birds have changed their migratory path or if their numbers are declining.

Join me.  Collect data on your hummingbirds for eBird and NestWatch. The greater the data, the better the science. 

What to do with a baby bird?