This paper describes some extensions added to the continuous simulation language OOCSMP to perform agent-oriented simulation. The extensions are tested by simulating the evolution of a colony of virtual ants (vants). In this simulation, each vant is modelled as an agent and is assigned a set of genes that control some aspects of its behaviour, such as its velocity, memory, communication abilities, scepticism, etc. Some emergent properties of the swarm of vants have been observed. Categories and Subject Descriptors I.6.2 [Simulation Languages], I.2.11 [Distributed Artificial Intelligence] - Coherence and coordination, Intelligent agents, Languages and structures, Multiagent systems General Terms Design, Experimentation, Languages. Keywords Agent-based simulation, Swarm Intelligence, Multi-agent languages, Artificial ants, Evolution, OOCSMP.