This lavishly illustrated book highlights the conservation importance of congregatory animals species--those which gather in vast groups. It also focuses on the irreplaceability of the congregation sites which are able to support such large gatherings of animals, fish, or birds.

When we define argumentation as a communicative activity aimed at convincing a reasona-ble critic of the acceptability of a standpoint by putting forward information justifying or refuting this standpoint, it is clear that elements of this information can be brought forward in other than verbal modes. An important question is then whether visually presented information needs to be translatable into a set of propositions as traditional definitions require. The answer is: not always.