Compared to the mountains, lowland forest is hot, dry, and typically has few breeding resources for dendrobatids. Still, poison frog diversity is high in the lowlands and most species are still found to be abundant. Bromeliads are less commonly found, except in the canopy or wet areas (e.g. Iquitos). Xanthosoma are normally restricted to roadsides, which in the lowlands are too hot for most species. Tree-holes, however, seem to be more common, perhaps due to the presence of large trees with elaborate buttresses. These structures are used by most species of Ranitomeya, as well as some terrestrial species such as Hyloxalus azureiventris. Due to the heat and lower humidity of the lowlands, most species are active only in the morning and evening, or during rainy periods. Some species, such as R. reticulata, have assumed a terrestrial lifestyle presumably to remain close to the humid ground, which allows them to be active throughout the day. Most lowland forests surpass 30 C in the day, and may only drop to 27 C at night.