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This is from 楽しいムーミン一家. You can watch the full dialogue
[here](http://www.dailymotion.com/video/x11votv_%E6%A5%BD%E3%81%97%E3%81%84%E3%83%A0%E3%83%BC%E3%83%9F%E3%83%B3%E4%B8%80%E5%AE%B6-34-%E3%81%9F%E3%81%93%E3%81%AB%E4%B9%97%E3%81%A3%E3%81%9F%E3%83%9F%E3%82%A4_shortfilms)
starting from 2:35 if you need more context. The part I'm asking about begins
around 3:25.

Basically, winter is coming so Snufkin is planning to go on a journey as
usual. Moomin doesn't want to part with his friend so he asks Moomin Papa if
he can go together with Snufkin. Papa says:

> スナフキンは孤独を愛している。だから、彼には一人旅がどうしても必要なんだ。
>
> Snufkin loves to be alone. For him it needs to be a solitary journey no
> matter what.

To which Moomin replies:

> それは僕 **だって** 知ってる…

The overall message is undoubtedly "I know that" but what does だって add here?
My guess is that it means "I know that better than anyone else" but I'm not
sure... It doesn't seem to match the dictionary definitions.
CC BY-SA 3.0
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particles
What does だって do in 「それは僕だって知ってる…」?
This [link](http://ejje.weblio.jp/content/%E3%81%A0%E3%81%A3%E3%81%A6)
definition #1, and this
[link](http://ejje.weblio.jp/sentence/content/%22%E7%A7%81%E3%81%A0%E3%81%A3%E3%81%A6%22).

Translation: " ** _Even_** I know that." or "I **_too_** know that".
CC BY-SA 3.0
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"だって" has two different meanings, ①"even" as ishikun answered, and ② "as I
heard (someone says). You can use it in such a way;

In case ①:

地球が丸いことなんて、3歳の子供 **だって** 知っている - The earth is round in shape, even 3-year old
boy knows that.

僕 **だって** "How do you do?"くらいは言える - Even I can speak (a basic thing like) How
do you do?.

パパ **だって** 僕に嘘ついたじゃん - Even dad told me a lie!

In case ②:

彼、会社を辞めるん **だって** ？ I heard he is leaving the company. (Is it true?)

彼女留学するん **だって** They say she is going to study abroad.

明日は晴 **だって** (The weather forecast says) it's fine tomorrow.
CC BY-SA 3.0
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