With warmer weather, the Cape, Coast and Islands are seeing the return of many migrating birds. Ospreys are back, and hummingbirds will be here soon. Year-round birds are also gearing up for the nesting season with great intensity. Mark Faherty just returned from a trip to Tanzania, and he shares his experiences with animals he encountered there (see slide show). Mark is a wildlife biologist at Wellfeet Bay Wildlife Sanctuary . We hear about various nests being built, bird songs to listen for at