This solar-charged monkey toy that uses solar energy to climb the rope, hand over hand, is probably the first of its kind that we've seen.
Unfortunately, there is some assembly required, but it'll teach the young'ns about how monkeys need to often be under direct sunlight. The solar chimp will cost you about £14.19 ($US20), and while the product description says its suitable for kids over 8, I don't think anyone over the age of 8 is going be lining up, Hannah Montana tickets style. Your best bet is to hang it by a window and hope your toddler can comprehend "photovoltaic arrays" even though their thoughts will be more, "where's my DS?" [Select Solar via DVICE]