The partnerships between flowering plants and the animals that pollinate them are some of the most familiar in the natural world. The active nature of animals typically casts the plants as the passive partners in this alliance, but in reality, they're just as involved. That becomes particularly apparent when the animals renege on their partnership.
Nicotinia attenuata, a type of wild US tobacco, is usually pollinated by hawkmoths. To lure them in, it opens its flowers at night and releases alluring chemicals. But pollinating hawkmoths often lay their eggs on the plants they visit and the voracious caterpillars start eating the plants. Fortunately for the plant, it has a back-up plan. It stops producing its moth-attracting chemicals and starts opening its flowers during the day instead. This simple change of timing opens its nectar stores to a very different pollinator that has no interest in eating it - the black-chinned ...
