The Toronto Zoo's twin panda cubs celebrated a month of being alive today by sleeping and being really cute.

Twin panda cubs sleep adorably as they continue to grow. (Toronto Zoo) The larger of the two cubs now weighs more than one kilogram, while the smaller one is about 750 grams.

Zoo staff say both cubs are healthy and continue to grow. Giant panda mom Er Shun is also doing well, the zoo says she's a great mother.

Er Shun continues to be a great mother and the cubs are progressing very well <a href="https://twitter.com/hashtag/TOpandacubs?src=hash">#TOpandacubs</a> <a href="https://t.co/GUIobCoIq6">pic.twitter.com/GUIobCoIq6</a> —@TheTorontoZoo

Her twin cubs were the first-ever giant pandas born in Canada. For the next several months, the cubs will remain in the maternity area of the giant panda house, which is not open to the public.

The pandas, which are on loan to the zoo from China, will be at the Toronto Zoo until 2018, when they'll move to the Calgary Zoo for five years.

<a href="https://twitter.com/hashtag/CUBUPDATE?src=hash">#CUBUPDATE</a> At one month old, our twin giant panda cubs are healthy and continue to grow <a href="https://twitter.com/hashtag/TOpandacubs?src=hash">#TOpandacubs</a> <a href="https://t.co/ZkQXGExTJN">pic.twitter.com/ZkQXGExTJN</a> —@TheTorontoZoo

War of adorableness on at the Zoo

The four white lions cubs are growing fast, the Toronto Zoo says. (The Toronto Zoo) All of the cute cubs at the Toronto Zoo might break the internet, they just keep one-upping each other.

Not to be outdone by their panda cub counterparts, the Toronto Zoo's white lion cubs are also showing off their adorableness.

The four white lion cubs, were born to mother Makali and father Fintan,on Sept. 26 at the Toronto Zoo.