And the percent of succesfull predation by the crow decreases as it goes deep into the colony, and this is the affect of mobbing and protecting offspring. ospreys : they skim the surface of water to find fish. the fish comes from a school of fish, which is moving. If you find a school of fish you do really well, and if you don"t find a school of fish you won"t be eating that day potentially. they have babies in rookeries, or large dense aggregations high above the water ( in rotten trees) Ic hypothesis predicts that individuals who are able to observe their neighbours catching food should be more successful in eating. graph shows (observational study) : the # of individuals that caught a fish that observed their neighbour returning with a fish. examples: lions and langurs: improved predation ability: sophisticated predation ability.