During development of the Drosophila nerve cord, neuroblast 7-3 gives rise to a pair of mitotic sister serotonin neurons in each hemisegment. Here we show that the zinc finger gene eagle, which is expressed in neuroblast 7-3, is essential for specifying the fate of serotonin neurons. We find that loss-of-function eagle mutations produce an unusual differential phenotype with respect to the sist...

The short-toed eagle (Circaetus gallicus) is a trophic specialist with a diet based almost exclusively on ophidians. In this work, the distribution of this eagle in southeastern Spain taken from national atlases, is analysed in relation to environmental variables. The results show that the short-toed eagle is distributed primarily in shrublands, probably because there it can easily locate and c...

pattern of cuckoos, based on the behaviour of a captive Himalayan Cuckoo Cuculus saturatus, which suddenly spread its wings and tail in a threatening attitude to my finger, thus displaying the hawk-like pattern of underwing and tail. This was very similar in appearance to a photograph of Accipiter nisus in a treatening posture. In that note I mention that the hawk-pattern of birds of prey may h...