SUMMARY1. The observations recorded were made with the object of ascertaining how the climatic environment of birds inhabiting the undergrowth of Evergreen Forest differs from the standard climate.2. The temperature is more equable, with almost the same minima, but with maxima about 3oC. lower all the year round.3. The relative humidity is not strikingly different from the standard for the locality, which is exceptionally high.4. In shade, with all sun‐flecks avoided, the visible light averages about 0–1 per cent, of full sunli