The Yellow Warblers have been present along with many other species of warblers at the Fox River Sanctuary in Waukesha Wisconsin. They continually forage like the rest of them up and down the trees hanging over the water. Like the others too, they always are flying back and forth across the river there as their eyes pick up flying insects above the water. Other warbler species present were Blackburnian, Palm, Northern Parula, Blackpoll, Black-and-white, Yellow-rumped, Magnolia, American Redstart and Chestnut-sided. Images were taken on May 14, 2014. The images appear to be males, so I added some at the bottom (last 4) that should be females taken at Wehr Nature Center back in 2013 for identifying females.
Binomial name: Setophaga petechia
Size: 5” long, 8” wingspan
Weight: .33 oz.
Habitat: Moist thickets along streams, wetlands, ponds, and swampy areas. They also inhabit dry areas such as, orchards, farmlands, forest edges, berry patches and gardens.
Diet: Mostly insects they pick from foliage and capture in flight.
Nesting: Typically a nest is built about 10’ from the ground but sometimes higher. Nests are located in the vertical fork of a bush or trees such as willow, dogwood or honeysuckle. The nest is cup size build with materials such as grasses, bark strips, and nettle plant material. The nest is wrapped with spider webs, plant down and fiber material. The inside lining can consists of materials such as dandelion, willow, cattail seeds, feathers and deer hair. The female lays 4-5 eggs, incubation last 10 to 14 days. The nesting period can be from 8 to 12 days.
Notes: Look for Yellow Warblers near the tops of small trees and tall shrubs.