一只“给池塘底部割草”的加拿大黑雁（Branta canadensis）

A Canadian Goose (Branta canadensis)

4/6/2026

In a park

Gemini said: That is a Canada Goose (Branta canadensis)

While it might look like it's diving for a snack in that second photo, it actually isn't hunting for fish! Here is the breakdown of what’s happening:

What is it doing?

This behavior is called "tipping up" or dabbling. Because geese have long necks but aren't deep-sea divers, they tip their bodies forward and point their tails toward the sky to reach food further down in the water column.

Is it eating fish?

No, it’s almost certainly not eating fish. Canada Geese are primarily herbivores. When they "tip up" like this, they are usually foraging for:

Submerged aquatic vegetation (like pondweed or eelgrass).

Roots and tubers of water plants.

Algae.

While they might accidentally swallow a tiny aquatic insect or crustacean attached to the plants, they don't have the beak structure or the instinct to hunt fish. Their bills have specialized serrated edges called lamellae, which act like little filters to help them grip slippery underwater plants and strain out water.

Key ID Features

The "Chinstrap": That iconic white patch on the black face and neck.

Body: A heavy, brownish-grey body with a pale chest.

Size: They are significantly larger than most ducks you'll see dabbling in the same way.

Basically, you caught this goose "mowing the lawn" at the bottom of the pond!

deepseek 把Gemini的英文译成了中文：

加拿大黑雁（Branta canadensis）

2026年4月6日
在公园里

Gemini 说：

那是加拿大黑雁（Branta canadensis）。

虽然第二张照片里它看起来像是在潜水找吃的，但它其实并不是在捕鱼。下面解释一下发生了什么：

它在做什么？
这种行为叫做“倒栽葱”或“浅水觅食”。因为大雁脖子很长，但不是深水潜水员，所以它们会把身体向前倾，尾巴指向天空，以便够到水中更远处的食物。

它在吃鱼吗？
不，它几乎肯定不是在吃鱼。加拿大黑雁主要是植食动物。当它们这样“倒栽”时，通常是在觅食：

• 水生植物（如眼子菜或大叶藻）

• 水生植物的根和块茎

• 藻类

虽然它们可能会不小心吞下附着在植物上的微小水生昆虫或甲壳动物，但它们没有捕鱼所需的喙部结构或本能。它们的喙部有特殊的锯齿状边缘，称为“栉状缘”，起到类似滤网的作用，帮助它们抓取湿滑的水下植物并滤掉水分。

主要识别特征

• “下巴带”：黑色脸部和颈部上那道标志性的白色斑块。

• 身体：厚重的灰褐色身体，胸部颜色较浅。

• 体型：比大多数用同样方式觅食的鸭子要大得多。

简单来说，你拍到的这只大雁正在“给池塘底部割草”呢。

https://www.youtube.com/watch?v=NiKBPnz5TDw?