Assertion: marsh harrier | /r/CapableOf | assemble in tall grassland
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text: Still, in Keoladeo National Park of Rajasthan (India) around 100 Eurasian marsh harriers are observed to roost together each November/December; they assemble in tall grassland dominated by Desmostachya bipinnata and vetiver (Chrysopogon zizanioides), but where this is too disturbed by human activity they will use floating carpets of common water hyacinth (Eichhornia crassipes) instead – the choice of such roost sites may be to give early warning of predators, which will conspicuously rustle through the plants if they try to sneak upon the resting birds