Beaver Pond, also known as Langsford Pond, is located on the outskirts of Cape Ann’s Dogtown. Exquisitely beautiful and peaceful, the pond is teeming with life, habitat largely created by the relatively new presence of the North American Beaver (Castor canadensis).
Beavers were absent from the Massachusetts landscape from 1750 to the early 1900s due to deforestation from agriculture and unregulated hunting and fur trapping. In the early 1900s forests began to recover as farmers abandoned their fields to work in cities. By 1928, a Beaver was found in Stockbridge. The public’s enthusiasm for the return of the beavers abounded and in 1932 three additional beavers from New York were introduced and released in Lennox. Today, Beavers have rebounded to the extent that some controlled hunting is permitted.
Beavers are ecosystem engineers and the ponds they create become wildlife magnets. Think about just this one example of the ecology of a beaver pond: woodpeckers make holes in the dead trees engineered by Beaver activity, Wood Ducks nest in the holes created by the woodpeckers, and raptors hunt the smaller birds.
More examples of how Beavers benefit other species of wildlife include favored nesting sites of both the Great Blue Herons and Osprey are the dead treetops of older trees in beaver swamps. Local species of turtles, the Snapping Turtle and the Eastern Painted Turtle, benefit from abundant vegetation created by beaver tree felling, which causes the forest to regenerate. Snapping and Eastern Painted Turtles prefer standing and slow moving water and hibernate under logs and lodges of Beavers. Painted Turtles also use floating logs to bask upon.
Like Niles Pond and Henry’s Pond, Langsford Pond is another superb example of a body of fresh water close to a saltwater cove where the combination of the two ecosystems provides shelter, nesting sites, and an abundance of food. While at Langsford Pond, I often see Great Blue Herons, swooping overhead, coming and going, between feeding grounds at the head of Lobster Cove and the shelter found in the vegetation surrounding the pond. Today, December 8th, a juvenile was seen on the far side of the pond, as were numerous Wood Ducks.
Since 1999, Langsford Pond has been protected by the Essex County Greenbelt Association. When I was filming there in October and November it was wonderfully overgrown and somewhat difficult to access. Recently, vegetation has been cut back, which makes walking to the pond’s edge much easier. Disease bearing ticks are present.
Some favorite Beaver food, ferns and American White Birch (Betula papyrifera).
Noticeably growing larger day by day, the biggest caterpillar of our batch of Cecropia Moth caterpillars (nicknamed Mothra) still has a ways to go before he/she pupates and becomes a cocoon for the winter.
The colorful protuberances with black spikes are thought to mimic either a poisonous plant or animal and are a defense against predators. Like most caterpillars, the Cecropia moth caterpillar has five pairs of prolegs. The green prolegs are blue at the base with a row of microscopic hooks, or crochets, that enable walking and clinging.
Although the Cecropia Moth has the largest wingspan of any moth found in North America, its caterpillar is not the largest caterpillar. That honor goes to the caterpillar of the Royal Walnut Moth, also called Regal Moth, which in its caterpillar stage is called the Hickory Horned Devil.
Thank you again to friend Christine for the Cecropia Moth eggs. The eggs that she gave me are the offspring of the male Cecropia Moth that she is holding in the photo above.
Don’t you love the colors of the third stage, or instar, of the Cecropia Moth caterpillar? Only about an inch and a half long in the photo, in the final fifth instar, before it pupates into a cocoon, the caterpillar will be as large as a large man’s thumb.
In its second instar in the above photo, the caterpillar resembles the developing birch flower catkins. This is an evolutionary form of mimicry against predation by birds. Cecropia Moth caterpillars eat not only the foliage of American White Birch trees, but also other species of birch trees, apple, ash, beech, elm, lilac, maple, poplar, Prunus and Ribes species, white oak, and willow.
Thank you so much again to my friend Christine for the gift of the Cecropia moth eggs.
No exciting news yet to report on our Giant Silk Moth Cocoon. The leaves of the American Birch Tree are unfurling, but no movement within the cocoon.
I am so excited to tell you about this wonderful find. I was walking my pooch Rosie on our usual route down to the harbor and, dangling at eye level from a tree that I have passed a hundred times this winter , there was this structure. Thinking it was what it is, I ran home and checked my Lepidoptera books, and it is the cocoon of a member of the Giant Silk Moth Family, Saturniidaee (not to be confused with the oriental silk moth, Bombyx mori, from which silk fabric is spun).
Hanging from the tip of the American White Birch branch you could easily mistake it for a dry withered leaf, and that is exactly what the caterpillar has done, weaving the leaf around itself to pupate within. The cocoon is quite a good size, approximately two inches in length by one inch in width. The caterpillar pupates during the summer, overwinters in the cocoon stage, then emerges sometime in May or June. Giant Silk Moths live only for about a week. They mate soon after eclosing and then perish. Giant Silk Moths do not have mouth parts; all eating is done during the caterpillar stage.
Several members of the Giant Silk Moth family of caterpillars eat birch leaves. I am hoping (and it looks a great deal like) it is the cocoon of the simply stunning Luna Moth, however it could also be the beautiful Polyphemus Moth.
Luna Moth ~ Images courtesy Google
Polyphemus Moth ~ Image courtesy wiki