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All posts for the month March, 2017

Ian Stewart, Ornithologist

One of the best ways to connect with nature is to monitor bird nest boxes. Regularly checking the contents of an active nest box lets you watch the whole breeding cycle unfold before your very eyes! It starts with nest building, progresses through egg laying and nestling rearing and then (hopefully) ends with the young birds successfully leaving the nest.

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Using an mirror to count Bluebird eggs

The Delaware Nature Society has a team of eager volunteers who monitor over two hundred boxes spread throughout several properties and every year brings more data and surprises. Our most common occupants are Tree Swallows, Eastern Bluebirds and House Wrens but most years we attract a few Carolina Chickadees, Carolina Wrens and Tufted Titmice. One year we had a White-breasted Nuthatch use one of our boxes – who knows what species might show up next?!

Chickadee on nest

Opening this nest box revealed a Carolina Chickadee sitting tightly on a nest. In these cases we leave the bird alone and retreat.

Checking boxes lets you see for yourself the many differences between each species in the way their nests are built, the shape and color of their eggs, and the appearance of their nestlings, as well as the nesting quirks of different birds. Did you know for instance that House Wrens often add spider cocoons to their nest, probably because the spider hatchlings eat arthropod pests mixed in among the nest lining?

Wren nest with spiders

House Wren nest lining dotted with spider cocoons

Our boxes remain in place year-round and provide winter refuges for both welcome and (slightly) unwelcome guests. Eastern Bluebirds roost in our boxes overnight during the winter, presumably to help them stay warm, and sometimes bundle together in the same box. Last winter one of our boxes at Coverdale Farm Preserve had an enlarged entrance hole and was filled with acorns from the huge old Red Oaks that line the driveway. This was probably a squirrel using the box to cache a supply of acorns to chomp on if a sudden snowfall made food hard to find.

chewed box

acorns

Mice also like to spend the winter in our boxes so we have to bump them out to allow the birds to nest. Can you spot the two mice jumping out of the box?

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We have been cleaning out our boxes to get them ready for spring and the birds are checking them out already so nesting isn’t far away! We can always use an extra person or two to help monitor nest boxes at Coverdale Farm or the Red Clay Reservation near Greenville, or Abbott’s Mill near Milford, so if you want to get involved just give us a call on (302) 239-2334. Boxes only need to be checked once a week and monitoring them makes a great excuse for talking a walk on a summer evening or weekend at these beautiful sites. All of our data are submitted to Cornell University’s ‘Nest Watch’ scheme so we are contributing to science as well as simply enjoying nature.

If you’d rather put up your own nest boxes why not join our upcoming program (April 27th at Ashland followed by a field trip to Coverdale on April 29th) to get advice on how to design and position boxes in order to attract nesting birds to your property? Having birds nest in a box you built yourself is a tremendously satisfying experience that may be repeated for many summers to come!

Tree swallows on box

A pair of excited Tree Swallows start building their nest in a brand-new box

By Joe Sebastiani, Ashland Nature Center Manager

In these not-so-wintry days with temperatures in the high 60’s, you are the only creature fooled into thinking it is spring.  Plenty of plants, and an abundance of animals are responding as though it is April.  During a walk at Ashland today, with 68 degree heat, I noticed some things that weren’t showing themselves this time last year.  The most exciting show at Ashland right now is the emergence of Wood Frogs.  Get out to Ashland within the week if you want to catch the action.  As I write this, the sound of the male’s “quacking” is percolating through my open window along with a warm breeze.  Listen to the short audio clip of the Wood Frogs calling from a small pond next to the Ashland Nature Center.

Male Wood Frogs like this one are currently "quacking" away, in the hopes of attracting a female to join him in the water.

Male Wood Frogs like this one are currently “quacking” away, in the hopes of attracting a female to join him in the water.

Wood Frogs lay clumps of eggs that will soak up water after they are laid.  The ones below my hand are newer than the ones on my hand.  Can you see the difference?

Once a male and female Wood Frog find each other, she will lay eggs such as these, and the male will fertilize them.

Once a male and female Wood Frog find each other, she will lay eggs such as these, and the male will fertilize them.

Although the American Bullfrog won't lay eggs until later in spring, I was surprised to see one surveying the scene at Ashland on this warm 1st day of March.

Although the American Bullfrog won’t lay eggs until later in spring, I was surprised to see one surveying the scene at Ashland on this warm 1st day of March.

A walk along the floodplain at Ashland Nature Center revealed several plants beginning their growth cycle for the year.  Several are non-native, invasive plants, but others are native.  The warm weather is giving these plants an early start this year, but it isn’t completely unusual.

Snowdrops are an ornamental, non-native plant that is found in the wild sometimes. They are always the first sign of spring here at Ashland, and they are in full bloom currently.

Snowdrops are an ornamental, non-native plant that is found in the wild sometimes. They are always the first sign of spring here at Ashland, and they are in full bloom currently.

Lesser Celandine is blooming along the Red Clay Creek at Ashland right now. Unfortunately, it is a non-native, invasive species that is devastating wildflower diversity along waterways in our area by smothering the native wildflowers.

Lesser Celandine is blooming along the Red Clay Creek at Ashland right now. Unfortunately, it is a non-native, invasive species that is devastating plant diversity along waterways in our area by smothering the native wildflowers.

This Skunk Cabbage is a native wetland plant that is already sending up its leaves in the wet forest.

This Skunk Cabbage is a native wetland plant that is already sending up its leaves in the wet forest.

The small, red female flower of the American Hazelnut is in bloom, but you have to look closely to find it!

The small, red female flower of the American Hazelnut is in bloom, but you have to look closely to find it!

The long, yellow male flowers of the American Hazelnut are much easier to see. This is always one of the signs that native plants are starting the new growth year, and it is fun to spot these shrubs in the woods right now, when they tend to blend in later on in the year.

The long, yellow male flowers of the American Hazelnut are much easier to see.  It is fun to spot these shrubs in the woods right now when they are more obvious.  They tend to blend in later in the year, making them tough to see.  Can you find the small, red female flowers in this photo?

One of the early signs of spring I have NOT noticed yet is the Groundhog.  My guess is that during this early warm spell, they have decided not to show their faces, after  predicting we would have six more weeks of winter.  WRONG!!

Finally, the insects are also out and about.  I have seen Anglewing butterflies, true flies, a dragonfly, and many smaller, unidentifiable forms buzzing around lately.  The prize in this category, however, goes to the inch-long larvae of one of our firefly species that we found crawling on Ash trees.  We found dozens of them, and watched as they scampered around the trunks, looking for smaller insect to eat.

This large Firefly larva was crawling around the trunks of trees on the floodplain. They must have recently emerged, since there were dozens of them. These insects will dine on smaller insects they can catch as they slink up the trunk.

This large Firefly larva was crawling around the trunks of trees on the floodplain. They must have recently emerged, since there were dozens of them. These insects will dine on smaller insects they can catch as they slink up the trunk.