Malham is an important and very visible site for nesting Peregrines. The restriction applies to Caveat Wall on the Left Wing, from Hangover (route 57 in YMC guide) to The Man and the Myth (route 8) inclusive. The whole of Terrace Wall and all trad routes on the Right Wing to the left of Scorpio are unaffected this year.
When topping out from climbs on the left wing, please move away quickly once both climbers have topped out to avoid disturbing the birds. (This area will be fenced off during nesting season to prevent public access to the top of the crag and large number of people who could disturb the birds - access for climbers exiting the crag is fine providing it is discreet so as not to encourage the public onto the top of the crag. It's also worth mentioning that you will be doing this to the RSPB peregrine watch volunteers if they are present as you walk in to avoid any confusion.)
Please also be aware that house martins are nesting on a number of the Cat Walk sport routes this spring and given that the nests are in unavoidable locations such as crucial jugs, the following routes should be avoided until the nests are no longer in use (usually into August): Raindogs/Rainshadow, Overnite Sensation, Thriller/Victor Hugo and Zoolook.