Identification: What is this plant?

http://media.snimka.bg/s1/2958/032160327-big.jpg Can someone tell me what this plant is because i want to put it in my terrarium and do not know if it is compatible with my animals and temperature/humidity. Thank you in advance!

 

Kaffir lime?
http://en.paperblog.com/thai-lime-time-16136/

 

I think you are right. Thank you!

 

The petiole seems too small for it to be kaffir lime. Grapefruit or pummelo is more likely. It's a citrus tree in any case.

 

both Citrus maxima and Citrus sinensis have this type of "leafy" petiole.