Caerostris darwini in Madagascar: river-spanning orb webs up to 25 metres wide
Studies on Darwin’s bark spider (Caerostris darwini; family Araneidae), endemic to Madagascar’s forests and wetlands, explain that only large adult females (black with white hairs; larger than males) produce the toughest recorded spider silk. It builds the largest orb webs above rivers/lakes, up to 25 m wide. Silk exceeds steel and most human-made fibres; used for safety lines, anchors and escape ropes. Threats include river/wetland degradation, hydroelectric dams and pollution, affecting prey and silk; webs aid flying-insect control.
The Hindu



