Luckily, yesterday, I got to see a large group of Prothonotary Warblers in the underbrush near the river. The 4 fledglings seemed to show no fear at all as they foraged through the underbrush under their Mom’s watchful eye. They were really busy, comical, and by the length of their short tails; apparently a second or even third clutch of 2012 for these parents. Looks like they will all be ready to migrate in a month. WOW, what a sight.
Cool Facts
- The Prothonotary Warbler is one of only two warbler species that nest in cavities. (Lucy’s Warbler is the other.)
- Go here to take a look at what goes on inside a Prothonotary Warbler nest, through the help of a Nest Box Cam provided by The Birdhouse Network at the Cornell Lab of Ornithology.
- The name “Prothonotary” refers to clerks in the Roman Catholic church, whose robes were bright yellow.
Nesting
Nesting Facts
- Clutch Size
- 3–7 eggs
- Number of Broods
- 1-3 broods
- Egg Length
- 0.7–0.7 in
1.8–1.9 cm - Egg Width
- 0.6–0.6 in
1.4–1.5 cm - Incubation Period
- 12–14 days
- Nestling Period
- 9–10 days
- Egg Description
- White spotted with rust-brown to lavender.
- Condition at Hatching
- Helpless, eyes closed, with minimal down.
Nest Description
Males select at least one cavity and place moss inside prior to attracting a mate. Females then build the remainder of the nest with a foundation of mosses or liverwort. The nest cup is made of rootlets, plant down, grape plants, or cypress bark lined with grasses, sedges, tendrils, rootlets, leaves, petioles, poison ivy, and even fishing line. The nest cup is about 2 inches wide.
Nest Placement
Cavity
Prothonotary Warblers place their nests in low cavities such as old Downy Woodpecker holes. Bald cypress, willows, and sweet gum are regular trees used for nesting and cavities tend to be in trees located near or over standing water. These warblers sometimes use bird boxes, gourds, and cypress knees for nesting.
Behavior
During the breeding season male Prothonotary Warblers defend territories by chasing away intruders or snapping their bills. Females may enter into bill-snapping disputes with other females as well. In flight they tend to stay below the canopy, but some birds also fly above trees when singing a lengthy song. Prothonotary Warblers forage by hopping in vegetation or on the ground and sometimes climb on tree trunks. When courting, the male flies close to the female and both birds chip softly. The male shows off possible nest cavities, entering and exiting them. Once a pair forms, the male guards the female while she is building the nest and laying eggs.
Breeding populations highly localized because of extreme habitat specificity, and are vulnerable to habitat destruction. Considered endangered in Canada.
My photos from Sunday 8/5/2012:
Dad or Mom
Fledgling 1
Fledgling 2
Fledgling 3
Fledgling 4 up close
Life and Wildlife along the Little Buffalo River 
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