Monday, September 17, 2012

Exotic hornets a danger to hummingbirds?

An article was recently published in The Southern Illinoisan about European Hornets attacking hummingbirds.

You can find the article at:

Hornets a danger to birds?
Witnesses have seen attacks on ruby-throated hummingbirds in region


The European hornet was introduced to the United States sometime between 1840-60. Eventually the hornet made its way to Illinois and is fairly common in wooded areas. It is found throughout the eastern United States and into the Dakotas.

The hornet, which resemble yellow jackets, but are much larger, have become somewhat more of a pest in recent years. Several Southern Illinois residents have reported seeing the hornets 
attack, and kill, ruby-throated hummingbirds.

“I saw the bugs kill four or five hummingbirds last year and this year while banding at Dave and Jean Conrod‟s place,” said Cathie Hutcheson in an email. “Dave saw one stinging a 
hummingbird in the grass and was able to swat it away, but as the bird flew away the bug chased it.”

The European hornet typically eats caterpillars, grasshoppers and other insects. They are also known to prey on honey bees.

“I can see that (attacks on hummingbirds) happening, but I‟ve never heard of it,” said J.E. McPherson, a retired professor of entomology at SIU. “If you look at these social wasps, when 
they go out and find something like a caterpillar, they have tremendous jaws.

“They will jump on a caterpillar and chew them up and make little meat balls. They bring them back to the nest to feed the larvae.”

“I‟ve heard occasional reports of that (hummingbird attacks),” said Chris Dietrich, an entomologist with the Illinois Natural History Survey. “I haven‟t heard anything unusual in terms 
of frequency. This is the first I‟ve heard of it becoming more of a problem than normal.”The European hornet typically nests in wooded areas, primarily in hollow trees. However, nests 
are sometimes found in barns, attics, sheds and in open spaces in walls.  

“They prefer forest habitats,” Dietrich said. “Mature trees, that‟s the kind of habitat they like.  They are not all that common in populated areas. It‟s a fairly widespread commond species that 
have been here a long time.”  Dietrich said the hummingbird-hornet interaction probably occurs when a hummingbird feeder is found near a nest. The European hornet is drawn to hummingbird feeders to prey on insects around the feeder.

Hummingbirds are in most danger when there are large numbers of the hornets. “Hummingbirds can hold their own in most cases,” Dietrich said. “If there is a nest near the 
feeder, the wasps tend to be more aggressive around their nests. 

“Typically, I haven‟t heard too many reports of them just attacking a hummingbird. They‟ll buzz, but they typically won‟t sting.”

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