Meet adorable Arnold, Warsaw Zoo’s latest resident!

Weighing just under two kilos, Arnold has been described by zoo officials as “extremely shy”. Warsaw Zoo

Described as “shy”, a tiny Java mouse-deer by the name of Arnold has taken residence at Warsaw Zoo after being transferred last week from the Swiss capital of Bern.

Arnold, who weighs just under 2 kilograms, has been placed in the zoo’s aviary due to its warm climate.

While the zoo’s social media describes little Arnold as being “extremely shy”, he has already made an impression on his room-mate, a mountain peacock, though zoo officials have happily reported that “it seems that they won’t get in each other’s way”.

Mouse-deer are the smallest-known hoofed mammals in the world, measuring around 45 centimetres long.USPN / Wikicommons

Mouse-deer are the smallest-known hoofed mammals in the world, measuring around 45 centimetres long and just 30 centimetres tall.

Some species of mouse-deer are commonly thought to be extinct in the wild, with just one sighting in the past 30 years.


Touting sharp protruding fangs and limbs comparable to the “diameter of a pencil”, mouse-deer tend to emit crying sounds to scare rivals away and are capable of becoming utterly motionless should a beam of light fall upon them.

While Arnold promises to be a future crowd-pleasing star, many Poles are already familiar with the specie: released at the end of 2019 by Luiza Kukulińska, a YouTube clip called ‘Myszojeleń (the Polish for mouse-deer), clocked up 7.3 million views in under a year.