Puzzling pictures show a strange unidentified creature roaming through a Texas zoo leaving city officials dumbfounded.

The mysterious night creature was spotted on a security camera at the Amarillo Zoo on May 21 at around 1.30am.

A still photo released by the zoo shows a lengthy creature standing on two appears to its legs outside the facility's fence.

Of course, the city is making a joke about it. This is no joke. To read more, click here.