Isaac spotted a blackbird, which he followed around the playground for several minutes.  At first he followed at five feet, causing the bird occasionally to hop or fly a small distance away.  Isaac then widened the gap to ten feet, at which distance the bird was unaffected.  The boy stalked the bird, not to harm it, but only to observe it.  He watched as the bird pecked at the grass and hopped in and out of the playground fence.  When at last the bird flew fifty yards beyond the playground, Isaac opened the gate and wandered around looking for it, until he gave up.  He later observed two squirrels and a wood pigeon (not the common street sort) for several minutes each.  The wood pigeon allowed Isaac to come within three feet.  Isaac never attempted to disturb the animals.  He just watched them.  He seems very interested in their behaviour.