Bright yellow might be from species crocus if you live in area where there are lots of flower gardens. I'm flat out jealous because up here north of Albany, there's nothing to be found, yet. (And I didn't know about crocus last fall in time to plant any.) Tussilago (coltsfoot) also has bright yellow pollen, perhaps you are warm enough for that already.
I have lots of pussy willow but it will be at least another 5-7 days before that's out in any strength. I have one brave bush of it in a protected space that may start to bloom in 3 or 4 more days. I saw foragers go out towads it today - and we are supposed to be getting a solid week of daytime highs in the low 50's - Woo-hooo! I am giddy with anticipation.
Send some of that pollen my way, please!
Enj.