I thought animals using tools was very interesting. For example, this video shows rooks raising water levels that they could not reach with their beak using stones or nuts to raise the water level. Birds also use sticks as tools to reach insects from logs, trees, and other hard-to-reach areas. Bowerbirds use intricate designs and "decorations" such as glass, plastic, beads, rocks, and other colorful items, such as clothes pins, bottle caps, etc. to make beautiful nests to attract mates. It is truly fascinating how animals can use various tools to adapt to specific challenges or adversity or to make their daily tasks easier.