From July through December water levels in the rivers decrease considerably reducing the sizes of rivers and lagoons and concentrating wildlife dependent on these habitats. Although it makes river travel up the smaller tributaries difficult, if not sometimes impossible, the chances of spotting certain species of aquatic wildlife is increased (otters, paiche). From January through June most of the area is flooded by water, with the highest level reached during March and April. This is the period of blooms and fruit production (which draws in the primates and many more) and allows small skiffs to enter a complex network of rivers, channels and hidden lagoons.
Throughout the year, many species of primates can be found near the riverbanks and overhead in the canopy, and the bird species to be seen year-round are varied, numerous and a thrill for all. A constant presence also is the pink and gray dolphins that have come to symbolize the Amazon basin waterways.
