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River kingfisher

life science Maturity 5-7 Next article →

River kingfishers are a special group of birds known as the subfamily Alcedininae. They are one of three subfamilies within the broader kingfisher family. These birds are famous for being compact and brightly colored. They usually have large heads, short tails, and long, pointed bills. While many people associate kingfishers with water, this group includes many different types of habitats. Most of these birds live in warm climates across Africa and parts of Asia. Some species even live as far away as Australia.

Oriental Dwarf Kingfisher
Oriental Dwarf Kingfisher

The way these birds look often tells us how they live. Many species show sexual dimorphism, which means males and females look different. For example, in the blue-banded kingfisher, the male has white underparts with a blue band. The female has orange underparts instead. Other species, like the Bismarck kingfisher, may have identical sexes. You can also tell what a bird eats by looking at its bill. Species that eat insects usually have red bills. This is because their bills are flattened to help them catch prey. Fish-eaters often have black bills.

♂ Common Kingfisher (Alcedo atthis) Photograph By Shantanu Kuveskar, Mangaon, Maharashtra, India
♂ Common Kingfisher (Alcedo atthis) Photograph By Shantanu Kuveskar, Mangaon, Maharashtra, India

Scientists have used advanced tools to understand how these birds are related. In 2007, a molecular phylogenetic study was published. This study looked at DNA to see how different species shared ancestors. Before this study, the groups were not considered monophyletic. A monophyletic group is a group that includes one ancestor and all its descendants. Because of this research, the species were rearranged into four monophyletic genera. This means the birds are now organized into more accurate biological families.

Ceyx erithaca
Ceyx erithaca

Today, there are 35 different species divided into four genera. One genus is called Corythornis, which includes the Madagascar pygmy kingfisher. Another group is called Ceyx. This group contains many small birds like the little kingfisher and the azure kingfisher. Most birds in the Ceyx genus have only three toes. However, the Sulawesi dwarf kingfisher is an exception. It still has a vestigial fourth toe, which is a tiny, leftover part from an ancestor.

The habitats for these birds depend on which genus they belong to. The Ceyx and Ispidina species mostly live in wet rainforests or woodlands. They do not always need to be near water to survive. In contrast, the Alcedo kingfishers are usually found near fresh water. They might live in open areas or inside a forest. The common kingfisher is a very successful species. It is the only one that lives across most of Europe and northern Asia.

Alcedo euryzona
Alcedo euryzona

Raising a family requires a lot of teamwork for river kingfishers. These birds are monogamous, meaning they stay with one partner. The pair works together to excavate a burrow in an earth bank. They lay two or more white eggs on the bare ground inside the hole. Both the mother and the father help incubate the eggs to keep them warm. They also both work to bring food to the chicks once they hatch.

Malachite kingfisher (Corythornis cristatus cristatus) Namibia
Malachite kingfisher (Corythornis cristatus cristatus) Namibia

There are some very strange things about how kingfisher chicks grow. The eggs are laid at one-day intervals. This means if food is hard to find, only the oldest and largest chicks get fed. When the chicks finally hatch, they are naked, blind, and helpless. They also have a very unique way of standing. Unlike adult birds, these young chicks stand on their heels. This unusual behavior is a specific trait of the river kingfisher chicks.

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🖼️ Images & Media (6)
File:African Dwarf Kingfisher imported from iNaturalist photo 63245166.jpg
African Dwarf Kingfisher imported from...
File:Malachite kingfisher (Corythornis cristatus cristatus) Namibia.jpg
Malachite kingfisher (Corythornis...
File:♂ Common Kingfisher (Alcedo atthis) Photograph By Shantanu Kuveskar, Mangaon, Maharashtra, India.jpg
♂ Common Kingfisher (Alcedo atthis)...
File:Oriental Dwarf Kingfisher.jpg
Oriental Dwarf Kingfisher.jpg
File:Alcedo euryzona.jpg
Alcedo euryzona.jpg
File:Ceyx erithaca.JPG
Ceyx erithaca.JPG
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