<span>Certainly. Every organism has a variety of different characteristics. One person writing a key might choose to use different characteristics than another person would use.
For example: Here's a key for separating fish, snake, frog and mouse
1. A. Has scales on its skin ... 2 B. Has no scales on its skin ... 3
2. A. Breathes with gills - fish B. Breathes with lungs - snake
3. A. Has hair or fur - mouse B. Has no hair or fur - frog
Here's a different key for the same four animals:
1. A. Has four legs ... 2 B. Does not have 4 legs ... 3
2. A. is warm-blooded - mouse B. is cold-blooded - frog
3. A. has fins - fish B. has no fins - snake</span>
It basically means that, because of the drought certain foods will be unavailiable. the birds will have to start eating other foods and over time evolution will change their beaks so that the can eat the new food easier.
