Duck Family 0630F: A Mysterious Increase in Ducklings, Coordinated Family Defense, and the First Signs of Flight

 On June 30, 2025, my daily urban wildlife observation recorded an unusually rich sequence of events among Eastern Spot-billed Duck families. The most striking discovery was that one duck family, previously seen with five ducklings, appeared to have increased to six after a lone lost duckling was observed the previous day. On the same day, I also recorded a surprising moment in which the Xf5 family seemed to make a coordinated rush toward another resting duck, as well as a young duckling from the large Af13 family briefly lifting off the water — a small but meaningful sign of approaching flight.

This article is based on continuous field filming of wild birds and other urban wildlife. I am not a professional researcher, and the interpretations here are personal observations and field notes. However, because I record and publish daily footage with filming-date codes, these videos also serve as chronological evidence across multiple days. This makes it possible to compare behavior, family composition, and individual changes over time.

Observation Date and Record Code

Filming record code: 0630F

Date represented by the code: June 30, 2025

Main subject: Eastern Spot-billed Duck families and other urban wildlife

Location type: Urban river, pond, weir, and surrounding waterside habitat

Overview of the Day

The day began with a search for a lost duckling that had been seen the previous day. This search led to one of the most important observations of the day: the エf family, previously recorded with five ducklings, appeared with six. Based on the timing, location, and visual impression, it seems likely that the lost duckling had joined this family.

This is not a conclusion that can be proven from one scene alone. However, when compared with the previous day’s record, the situation strongly suggests that the family composition had changed. This kind of day-to-day comparison is exactly why I try to preserve daily footage as completely as possible.

The Mysterious エf6 Family: A Duckling May Have Joined

Around 08:27, I found six young ducklings without their mother nearby. They appeared to belong to the エf family. Soon after, the mother returned, and by 11:12 the six ducklings were together with her.

At 13:21, the family was recorded as エf6-6: the エf mother with six ducklings, estimated at six days old.

This was surprising because the number of ducklings seemed to have increased. The previous day, a lone young duckling had been seen, and the most likely explanation is that this duckling joined the エf family. At first, I wondered if the lost duckling might have belonged to another family, but after comparing the size and face impression again, the エf family now seems the most plausible match.

This is especially interesting because similar small changes in duckling numbers have been observed in other families. In some cases, ducklings appear to vanish. In rarer cases, a family seems to gain one. Whether this is adoption, accidental joining, or temporary mixing remains unclear from my non-specialist perspective.

The Xf5 Family’s Coordinated Rush

At 15:33, the Xf5 family, with five ducklings aged about 20 days, approached from downstream.

At 16:45, one Xf duckling appeared to threaten or challenge a resting duck. Immediately after that, the family rushed forward together. The scene looked almost like a coordinated parent-and-duckling attack.

Of course, I cannot know the intention of the birds. It may have been defensive movement, territorial pressure, or a reaction to the other duck’s position. Still, the timing was remarkable: a duckling initiated a threatening posture, and the family followed with force. For an observer, it was one of those moments that makes ordinary daily recording feel unexpectedly dramatic.

The First Floating Moment of Af13

At 48:45, I found the Af13 family resting in the shade. This was a large family with 13 young ducks, now about 52 days old.

At 53:00, the Af13 family began moving. Then, at 53:07, one of the young ducks briefly lifted off the water. It did not fully fly away, but it clearly became airborne for a moment.

This was a joyful sign of growth. Around this age, the change from duckling to young bird becomes very visible: the body size, feather condition, wing strength, and movement all begin to shift. Seeing a young duck from a large family briefly “float” above the water felt like witnessing the beginning of flight.

Other Duck Families Observed

Several other Eastern Spot-billed Duck families were also recorded throughout the day.

Ef6-43 was observed near the weir and climbed it at around 06:34. The large carp in this area again appeared unusually big compared with the ducks.

Df5 was seen resting, and later appeared near an adult male duck. This male has been present often recently, though I cannot determine whether he is the father, a mate, or simply a nearby male.

Sf9 was seen resting around midday. Some ducklings in this family appear to have slightly yellowish bills, which has made me wonder about individual variation or possible hybrid-like traits. This remains only a personal observation, not a conclusion.

Gf7-46 was recorded resting in a neat line at 29:34, a peaceful contrast to the more dramatic scenes of the day.

Tf8-24 showed active duckling behavior, including failed nap attempts, movement through sun-dappled water, and confident travel through faster current.

Mf1-32 was also observed. Around this age, the change from downy juvenile feathers into more adult-like plumage becomes very noticeable, and this individual appears different almost every time I encounter it.

The Urban Habitat Was Full of Life

This observation day was not only about ducks. A female Common Kingfisher appeared early in the video, and later a Kingfisher and an Oriental Turtle Dove were recorded in the same scene. A Common Moorhen family was also observed, with the young bird still apparently receiving care. Dragonflies, including the beautiful Rhyothemis fuliginosa, were active around the pond.

These small side observations are important. They show that the duck families are part of a wider urban ecosystem, where many species share the same narrow waterside spaces.

Personal Notes and Interpretation

The most important point of this day was the apparent increase in the エf family’s duckling count. If the lost duckling from the previous day really joined this family, it may represent a rare and valuable case of duckling integration across family lines.

However, I want to be careful. Field observation is often incomplete. The mother may disappear behind vegetation, ducklings may be hidden by shade, and similar-looking young birds are difficult to identify. I can only say that, based on the sequence of daily records, the situation strongly suggests that the lone duckling became part of the エf family.

The Xf5 rush was another memorable event. It looked like coordinated action, but I cannot claim that the ducks planned it in a human sense. Still, it shows how dynamic and socially complex duck family behavior can appear when observed closely.

The Af13 young duck’s brief lift from the water was also a milestone. This was not full flight, but it was a clear sign that the young birds are approaching the next stage of independence.

Species Observed

- 日本語名：カルガモ

  English name: Eastern Spot-billed Duck

  Scientific name: Anas zonorhyncha

  Note: A resident duck species commonly seen in East Asia. Males and females have similar plumage, so family behavior and individual markings are useful for long-term observation.

- 日本語名：カワセミ

  English name: Common Kingfisher

  Scientific name: Alcedo atthis

  Note: A small, vivid blue-and-orange waterside bird. It often hunts fish from branches or stones near rivers and ponds.

- 日本語名：バン

  English name: Common Moorhen

  Scientific name: Gallinula chloropus

  Note: A wetland bird often seen walking on floating vegetation or swimming near dense cover. Parent birds may continue feeding young after they become mobile.

- 日本語名：キジバト

  English name: Oriental Turtle Dove

  Scientific name: Streptopelia orientalis

  Note: A common dove in Japan, often found in parks, riversides, and wooded urban areas.

- 日本語名：チョウトンボ

  English name: Butterfly Skimmer / Fluttering Glider

  Scientific name: Rhyothemis fuliginosa

  Note: A dragonfly with dark, shimmering wings. Its butterfly-like flight makes it especially noticeable around ponds in summer.

- 日本語名：コイ

  English name: Common Carp

  Scientific name: Cyprinus carpio

  Note: A large freshwater fish often seen in urban rivers and ponds. In this location, some individuals appear remarkably large compared with the ducklings.

Observation Policy

This article is written from the viewpoint of a long-term wildlife observer, not a professional biologist. The purpose is to preserve daily field records honestly and to share observations that may be useful for people searching for information about duck families, duckling behavior, urban wildlife, and rare-looking natural events.

Because the footage is recorded and organized by filming date, it can also function as chronological evidence. When unusual events occur — such as a lost duckling possibly joining another family, a duckling count changing over several days, or a young duck beginning to lift off the water — the surrounding daily records help provide context.

The interpretations here should therefore be read as careful field notes: sincere, evidence-based where possible, but always open to revision as new observations appear.