animal Arachnidae cross eight England garden invertebrate leg predator silk spider Sussex underside web arachnid capture creation creepy eating eight legs fascinating hairy halloween horror killer macro nature scary trap Araneae background brown closeup danger eye eyes fast forest glue green hair hairs impressive insect legs park patient scared sticky strong yellow abdomen arachnids arthropods body carapace cephalothorax chelicerae fang fangs gland inject insects mouth opisthosoma pedicel poison saavem segments spinneret tagmata two venom webs