none Techniques; Ecological techniques; Nutrition; Feeding behaviour; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Host parasite relationships Ephestia cautella (Pyralidae); Hymenopteran parasites; Nemeritis canescens; Host parasite relationships; Nemeritis canescens (Hymenoptera), host density & foraging relationship Nemeritis canescens (Ichneumonidae); Ecological modelling; Foraging patterns & optimum behaviour; Foraging; Patterns, model & theories of optimum behaviour; Lepidopteran hosts; Ephestia cautella; Host density & foraging relationship; Host parasite relationships; Ephestia cautella (Lepidoptera) density & foraging relationship; Host seeking; Ephestia cautella (Lepidoptera), foraging pattern model Bombus sonorus; Bombus (Apoidea ); Aves; Ecological modelling; Foraging patterns & optimum behaviour; Foraging; Patterns, model & theories of optimum behaviour Selasphorus platycercus (Trochilidae ); Furnarius (Furnariidae ); Phylidonyris nigra; Phylidonyris novaehollandiae (Meliphagidae ); Muscicapa striata (Muscicapinae ); Parus atricapillus; Parus major (Paridae ); Foraging; Patterns, model & theories of optimum behaviour