An international animal rights group has called on Thailand to ban controversial kickboxing fights between endangered orang-utans held daily at a Bangkok wildlife park. Mr Rosen said that such treatment could have a long-term effect on the species' survival and called for a boycott of the park. A verb is considered a phrasal verb if it consists of two or more words. One of these words is always a verb (e.g. call), while the other may be an adverb or a preposition (e.g. for, on). The meaning of a phrasal verb is often quite different from the meaning of the verb itself, as shown below. 'To call for' means 'to request, to demand an action or an event to take place'. Example: The members of the committee are calling for the president's resignation after his mishandling of the crisis. 'To call on' means 'to say publicly that you want someone to do something'. Example: The members of the committee are calling on the president to resign after his mishandling of the crisis.