David Tipling / Club-winged Manakin (Machaeropterus deliciosus) male displaying and stridulating, Milpe Bird Sanctuary, Pichincha province, Ecuador.

Tim Laman / Male Club-winged Manakin (Machaeropterus deliciosus) hitting his wings together (stridulating) over his back to produce a sound. Milpe Cloudforest Reserve, Ecuador, January. Endemic.

Tim Laman / Male Club-winged Manakin (Machaeropterus deliciosus) hitting his wings together (stridulating) over his back to produce a sound. Milpe Cloudforest Reserve, Ecuador, January. Endemic.

Tim Laman / Male Club-winged Manakin (Machaeropterus deliciosus) hitting his wings together (stridulating) over his back to produce a sound. Milpe Cloudforest Reserve, Ecuador, January. Endemic.

Tim Laman / Male Club-winged Manakin (Machaeropterus deliciosus) hitting his wings together (stridulating) over his back to produce a sound. Milpe Cloudforest Reserve, Ecuador, January. Endemic.

Tim Laman / Male Club-winged Manakin (Machaeropterus deliciosus) hitting his wings together (stridulating) over his back to produce a sound. Milpe Cloudforest Reserve, Ecuador, January. Endemic.

Pete Oxford / Cricket stridulating in Ngaga Camp, Odzala-Kokoua National Park, Democratic Republic of the Congo

Andy Sands / Roesel's Bush Cricket (Metrioptera roeselii) male stridulating, Hertfordshire, England, September

Nick Upton / Male Grasshopper (Stenobothrus rubicundulus) stridulating by rubbing its hind legs against its wings. Julian Alps, Slovenia, July.

Andy Sands / Field cricket (Gryllus campestris) male stridulating (creating noise by rubbing body parts together) at entrance to burrow, West Sussex, England, UK, July

Tony Phelps / Rhombic egg eater (Dasypeltis scabra) stridulating (rubbing scales) as part of defensive behaviour, Cape Town, South Africa

Kim Taylor / Stripe-winged grasshopper {Stenobothrus lineatus} male stridulating, Europe