Eastern Kingbirds hunting the insect emergence
June 6, 2026
The air above Suffield Wildlife Management Area shimmers with more than heat. Thousands of delicate wings catch the early summer light as mayflies, caddisflies, and midges rise from the water in synchronized clouds. This is emergence week, when aquatic insects complete their transformation and take to the air in numbers that can darken the sky.Eastern Kingbirds wait for this moment. Perched on fence posts and dead branches along the wetland edges, they launch themselves into the swirling masses with mechanical precision. Each sortie lasts only seconds. The kingbird darts upward, snaps its bill shut around a mouthful of insects, and returns to its perch to swallow before launching again. Their white tail bands flash like semaphores as they work the emergence.These insects have spent months or even a full year underwater as nymphs and larvae, breathing through gills, feeding on detritus and algae. Now they must shed their aquatic skins, unfurl new wings, and mate before their brief aerial lives end. Most will live only hours or days as adults. The mayflies are especially ephemeral, their mouthparts so reduced they cannot feed at all. They exist only to reproduce, rising in coordinated swarms that can stretch across miles of water. The caddisflies emerge more gradually, their tent-shaped wings carrying them away from the water to find mates in the surrounding vegetation. The midges, smallest and most numerous, dance in loose columns that pulse and weave like smoke.For the kingbirds, this abundance means everything. During peak emergence, a single bird can capture hundreds of insects per hour. The protein fuels their own breeding efforts and feeds their nestlings, which are demanding more food as they grow toward fledging. The timing is no accident. Kingbirds nest when aquatic insect emergence peaks, their breeding cycle locked to this brief window of plenty. Other aerial insectivores, tree swallows and bank swallows, work the same emergence from different heights, but the kingbirds own the middle air space, their aggressive nature keeping competitors at bay. They will chase hawks, crows, even eagles that venture too close to their feeding grounds, but they tolerate the smaller swallows that hunt above and below them. The water ripples with the disturbance of more insects breaking the surface, and somewhere overhead, another kingbird launches into the rising swarm.
Two warblers claim the oak canopy
May 22, 2026
The white oaks at Still Brook Park have finished their spring expansion, each leaf now broad and firm in the late May warmth. Their canopy forms a continuous green ceiling thirty feet above the forest floor, dense enough to filter the morning light into shifting patches. Step outside if you can and listen upward. The oak crowns hold something new this week.Two southern breeding birds have just arrived to claim territories in these branches. The hooded warbler moves through the mid-canopy with quick, deliberate hops, its black hood stark against the yellow throat and breast. This small songbird winters in Central America and arrives here in Massachusetts later than most warblers, timing its journey to coincide with the full leaf-out that provides both insect prey and nesting cover. The white-eyed vireo works the same canopy layer, methodical where the warbler is restless. Its pale eye catches the filtered light as it searches the oak leaves for caterpillars and emerging insects. This vireo also winters far south and reaches its northern breeding limit here in Massachusetts, making each pair a notable presence in these woods.Both species depend on the oak's spring abundance. The white oak's flowers have finished blooming, but their brief flowering drew countless small insects that now feed and reproduce among the expanding leaves. Moth caterpillars emerge from eggs laid on the fresh foliage, and aphids cluster on the tender growth. The hooded warbler specializes in catching insects on the wing, darting from a perch to snatch flies and small moths before returning to the same branch. The white-eyed vireo works more slowly, examining each leaf surface and twig joint for hidden prey. Their different hunting styles allow both species to use the same oak canopy without direct competition. The vireo builds its cup nest in the dense understory shrubs below, while the hooded warbler places its nest in the low branches of saplings and shrubs, both relying on the oak canopy above for the constant stream of insects needed to feed their young.These arrivals mark the peak of the breeding season's complexity. The oaks support not just these two southern visitors but resident species like the great crested flycatcher and red-bellied woodpecker, each occupying its own niche within the same trees. The invasive garlic mustard spreads across the forest floor below, altering the understory that both warblers need for nesting, but the oak canopy itself remains a reliable resource. The hooded warbler's clear, ringing song carries from the mid-canopy now, a series of notes ending in a distinctive flourish. If you stand quietly beneath these oaks, you might hear both species calling from the same tree, the vireo's harsh, chattering notes mixing with the warbler's musical phrases. Close your eyes and let the layered sounds of the canopy wash over you. The leaves rustle with more than wind.
Monarch caterpillars feeding on milkweed flowers
June 25, 2026
The common milkweed patches near Westfield Center are in full bloom right now. The flower clusters are dense and rounded, each one packed with small pink-purple florets that smell faintly sweet in the heat of midday. Look closely at any milkweed stem and you may find what you're looking for: a monarch caterpillar, banded in yellow, black, and white, working its way through the plant with steady, methodical biting.Monarchs lay their eggs on common milkweed and nothing else. The caterpillar that hatches has one food source, and this is it. What makes this relationship so specific is chemistry. Common milkweed produces cardenolides, a class of compounds that are toxic to most animals. The monarch caterpillar not only tolerates them but sequesters them in its own tissues, which makes the caterpillar itself unpalatable to most predators. Blue jays, which are foraging through the shrubs and trees nearby right now, have learned through experience to avoid monarchs. A jay that eats one typically vomits and does not repeat the mistake. The caterpillar's bold banding is the signal that enforces that lesson.The timing of the caterpillar's peak feeding stage and the milkweed's flowering is not coincidental. Monarch adults arrive in this part of Massachusetts in early summer, when milkweed plants are mature enough to support larvae but still actively growing. The flowers themselves are part of the caterpillar's diet. Early instars tend to feed on the undersides of leaves, where the leaf tissue is thinner and easier to chew. But by the third, fourth, and fifth instars, a caterpillar will consume entire leaves, flower buds, and open florets. The flowers are high in sugar and protein relative to the leaves, and a caterpillar in its final instar before pupation can consume a full milkweed leaf in under an hour. What you see on a milkweed plant in early summer is not just feeding; it is a caterpillar building the fat and protein reserves it will need to complete metamorphosis and, if it is a late-summer individual, to fuel a migration of more than a thousand miles.Common milkweed does more than feed monarchs. The flowers produce nectar that draws a wide range of insects, including native bees, wasps, and beetles, some of which are also pollinators. The plant's pollination mechanism is unusual. Pollen is packaged in small sacs called pollinia, which attach to the legs of visiting insects and are carried to other flowers. The plant depends on insects large enough to pull the pollinia free, which is why smaller insects sometimes get trapped in the flower's grooves and die there. American goldfinches, which are present along the reservoir edge nearby, will return to milkweed later in summer to pull the silky fibers from the seed pods for nest lining. The plant is used at multiple stages, by multiple species, for different purposes.
