Hammerkop

Fascinating facts about the Hammerkop

• At 56 cm tall and 470 g light, the hamerkop looks like a medium-sized waterbird, but its bill stretches 80-85 mm, about the length of a small ruler, giving it a hammer-shaped profile that hints at its name. This size lets it wade in shallow wetlands while the long, thin bill probes mud for hidden fish and frogs. Its short legs rapid, jerky gait.
• A hamerkop's nest can span more than 1.5 m across, and its mud-plastered entrance measures 13-18 cm wide, leading through a tunnel up to 60 cm long into a nesting chamber. Building such a fortress takes 10-14 weeks and may require about 8,000 sticks or grass bunches.
• Pairs are compulsive builders, erecting three to five nests each year whether they are breeding or not, and in a Ugandan hotspot 639 nests were counted within just 8 km², about 80 pairs cramming their homes into a space the size of a large city park. Such density shows the species tolerates close proximity despite not being truly colonial, and the abundance of nests also attracts owls, snakes and other birds that later reuse the sturdy structures.
• When hunting, a hamerkop can be astonishingly efficient: in a 45-minute bout one bird succeeded on 27 of 33 attempts, and during a termite nuptial flight it snatched 47 alates in just five minutes. These numbers illustrate how the bird's flexible foraging, walking, probing mud, or hovering low over water, lets it exploit both solitary prey and massive, short-lived insect swarms, turning fleeting opportunities into substantial meals.
• The hamerkop lays three to seven eggs, each about 44.5 mm × 33.9 mm and weighing 27.8 g, and both parents share incubation for roughly 30 days. After hatching, chicks stay in the massive nest for 44-50 days before fledging, yet they keep returning to roost there until they are two months old. This prolonged nest use, made possible by the thick walls.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

At a glance

About the Hammerkop

In the sun-drenched wetlands, the hammerkop moves with an air of quiet purpose, its stout body gliding effortlessly across the marshy terrain as it searches for unsuspecting frogs and fish to snatch from the shallows. With its distinctive hammer-shaped head held high, this enigmatic bird navigates its domain with a subtle blend of stealth and precision, its large, dark eyes ever-vigilant for the next meal. As it wades through the reeds, the hammerkop's soft, whooshing calls weave a soothing melody into the soundscape of the African wilderness.

Hammerkop photographed on Feravox

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