Seeing and commenting on the thread about least favorite bonus cards, I wanted to start a thread about our own personal tier list. This is just mine and I give my reasoning for them. I'd like to see what you guys have. Cards with similar investment, I put together.
S-Tier
Ecologist (Birds in your habitat with the fewest birds)- Great bonus card with a super simple condition that usually nets you a minimum of 4 pts, an average of 6. I've seen people score 8 with this card. Just really good.
Fishery Manager (Birds that eat fish)/Viticulturist (Birds that eat fruit)- Low investment for a good amount of points. 2 birds automatically nets you 3 pts. 4 gets you 7pts. Lots of birds eat these food types. Most wetland birds eat fish, so even low investment in the Wetland gives you 3 pts. Many useful birds also eat fruit.
Prairie Manager (Birds that can only live in Grassland)- The best habitat bonus card. Just 2 birds gives you 3 pts. And since laying eggs is the most effective way to get points, getting this bonus card can really help you when behind or further distance yourself for a victory.
A-Tier
Anatomist (Birds with body parts in their names)/Cartographer (Birds with geography terms in their names)- Pretty good cards with low investment cost. Minimum 2 birds nets you 3 pts, 4+ nets you 7. However, since these cards respective conditions are more specific than Fishery Manager and Viticulturist, it keeps them out of the S-Tier for me. I often just get the low score from these cards, but I sometimes get the max. Usually for Cartographer and more infrequently for Anatomist. Not sure why, maybe it's just my experience.
Enclosure Builder (Birds with ground nests)/Nest Box Builder (Birds with cavity nests)/Platform Builder (Birds with platform nests)/Wildlife Gardner (Birds with bowl nests)- Though these cards require more investment than the others listed so far (minimum 4 birds for low score), they are easily achieved with help from birds with Star nests. Since end-of-round goals often require eggs in these nest types, most of them, you'll achieve the low score.
Omnivore Expert (Birds that eat wild)- While the condition isn't the greatest (2 pts per bird), the fact is a lot of really good birds eat wild, especially the beloved Crows. So this bonus cards is quite easy to rack a lot of points in. To me, it's the best bonus card that gives 2 pts per bird.
B-Tier
Forester (Birds that can only live in forest)- A bonus card that gives a lot of points (8 pts) for heavy investment. Problem is that investing heavily in the Forest is a risk because you want to laying eggs towards the end-game. Investing that much into the Forest deprives you of doing that. However, this weakness is offset by the fact that the Forest has a lot of Forest-only birds that let you draw extra bonus cards for a lower cost than Wetland Scientist. Plus, the minimum investment is 3 birds for 4 pts. I don't think there is a Forest-Only bird that lets you draw extra bonuses that cost more than 2 food. At least none that come to mind.
Food Web Expert (Birds that eat only invertebrate)/Historian (Birds named after a person)/Bird Counter (Birds with a tucking power)- A group of 2 pts per bird bonuses that give some easy points for minimal investment. The issue is their conditions making trying to maximize the score of these bonuses risky. Food Web Expert has a lot of low score birds. Historian has a specific condition that can conflict with your engine since many of the birds don't synergize well with each other. Bird Counter is the best one of the group, but since there are a lot of good cards in this group (American Robin, Purple Martin, Barn Swallow, House Finch, etc.), you'll probably be competing hard with your opponent to get them. Overall, they are nice bonus cards, but not great.
Rodentologist (Birds that eat rodent)/Falconer (Birds with a predator power)- I put these cards together because they are rather intertwined: most birds that eat rats also have a Predator Power. There are really good cards in this group, with high card value and high potential to get even more points through the Predator Power. However, there are a few downsides to these cards. The first being at the Vultures and Black-Billed Magpie exist. Yeah, there are only 3 of them, but their ability can effective neuter that point potential you can achieve, because giving your opponent 1 food of their choosing versus your 1 point isn't worth it. The second downside is that most of these birds have a high food cost. There are some that are cheap (Cooper's Hawk, Red-Shouldered Hawk, Barred Owl, etc.), but most cost at least 2 food, and often times 3. The final downside that one of the two Predator Powers is terrible: the one that rolls the food dice in the box that gives you a point if it matches their type. Just a really poor ability that doesn't help you most of the time.
Oologist (Birds that have at least 1 egg laid on them)- A card with a high investment, but simple condition. As mentioned, you want to lay eggs in the end-game. This card is easy to get a few extra points by doing something you should already be doing.
Passerine Specialist (Birds with wingspans 30 cm or less)- A lot of really good birds are within this group (Baltimore Oriole, Blue-Winged Warbler, Sprague's Pipit, etc.) that make getting the low score not hard to obtain. It is a high investment (4 birds for 3 pts), but this bonus card hits more often than not.
C-Tier
Wetland Scientist (Birds that can only live in wetland)- The worst habitat bonus card, but it's still decent. Getting the low score is easy. Getting the high score is difficult. The Wetland is the one habitat that you don't want to heavily invest in. 2-3 birds is all you really need. Sure, it can synergize with cards like Fishery Manager and Falconer, but without it, it's hard to justify going hard in the Wetland. A lot of the really good birds in the Wetland also have a high cost (Trumpeter Swan, Roseate Spoonbill, Wood stork, etc.). Even King Rail. a 4 pt bonus bird, costs 3 food! So, while better than other bonus cards further down the list, if I had better options, I pass on this one.
Photographer (Birds with colors in their names)- You'd think this bonus card would be really good because over 1/3 of the cards in this game meet this condition. It's not. First, it's a card with a specific condition. Second, many of those cards don't synergize well with each other. Third, it requires a large investment to reach the low score (4 birds for 3 pts). While you can get the low score often, most of the time, you are looking for birds that work well with the engine you are building, so you'll be passing on a lot of birds that meet this condition.
Large Bird Specialist (Birds with wingspans over 65 cm)- This bonus card is strictly worse than Passerine Specialist because most of the birds in this category have high costs (The good ones being 2 food minimum, usually 3) and requires a lot of investment (4 birds for only 3 pts). If you are investment in these kinds of cards, then it can work for you. I sometimes hit the minimum score, but rarely the top socre.
D-Tier
Backyard Birder (Birds worth less than 4 points)- Yes, there are good cards in this category (the almighty tuck power birds), but as I said before, you are probably competing for your opponent for those cards. Besides them, a lot of these other cards are just really bad. You have some exceptions (Spotted Towhee, Blue-Gray Gnatcatcher, Yellow-Bellied Sapsucker, Song Sparrow), but most birds in this category don't have abilities that are worth justifying a most of your capital (and more importantly, your turns) playing low cost birds just to reach the low score (5 birds for only 3 pts).
E-Tier
Breeding Manager (Birds that have at least 4 eggs laid on them)- The worst egg-laying bonus card. Yeah, there are good birds that have 4 or more slots in their nest. But only 1 pt per bird? 5 birds only give you 5 pts! This is just a really bad bonus card and will only give you a couple of extra points at best. That can make the difference, but I would only choose this bonus card over any other except for one, which is the bonus card in the F-Tier. At least this card gives you some points by doing something.
F-Tier
Visionary Leader (Bird cards in hand at end of game)- A bonus card that rewards you... for not playing cards. Or doing any other action than just drawing cards. So, while your opponents are playing cards and laying eggs for fulfill bonuses and end-of-round goals, this bonus is doing nothing for you. This bonus card is the only bonus card that doesn't even help for an end-of-round goal. Absolutely awful bonus card. The one time, and really the only time, this card could have any benefit is you have a combo of Ruddy Duck, Pied-Billed Grebe and Common Yellowthroat to draw more cards because you had an awful starting hand. Or you somehow plan to play your strategy strictly through the Wetland (Not the greatest of strategies). Even still, I toss this bonus card into the the discard deck every time.
S-Tier
Ecologist (Birds in your habitat with the fewest birds)- Great bonus card with a super simple condition that usually nets you a minimum of 4 pts, an average of 6. I've seen people score 8 with this card. Just really good.
Fishery Manager (Birds that eat fish)/Viticulturist (Birds that eat fruit)- Low investment for a good amount of points. 2 birds automatically nets you 3 pts. 4 gets you 7pts. Lots of birds eat these food types. Most wetland birds eat fish, so even low investment in the Wetland gives you 3 pts. Many useful birds also eat fruit.
Prairie Manager (Birds that can only live in Grassland)- The best habitat bonus card. Just 2 birds gives you 3 pts. And since laying eggs is the most effective way to get points, getting this bonus card can really help you when behind or further distance yourself for a victory.
A-Tier
Anatomist (Birds with body parts in their names)/Cartographer (Birds with geography terms in their names)- Pretty good cards with low investment cost. Minimum 2 birds nets you 3 pts, 4+ nets you 7. However, since these cards respective conditions are more specific than Fishery Manager and Viticulturist, it keeps them out of the S-Tier for me. I often just get the low score from these cards, but I sometimes get the max. Usually for Cartographer and more infrequently for Anatomist. Not sure why, maybe it's just my experience.
Enclosure Builder (Birds with ground nests)/Nest Box Builder (Birds with cavity nests)/Platform Builder (Birds with platform nests)/Wildlife Gardner (Birds with bowl nests)- Though these cards require more investment than the others listed so far (minimum 4 birds for low score), they are easily achieved with help from birds with Star nests. Since end-of-round goals often require eggs in these nest types, most of them, you'll achieve the low score.
Omnivore Expert (Birds that eat wild)- While the condition isn't the greatest (2 pts per bird), the fact is a lot of really good birds eat wild, especially the beloved Crows. So this bonus cards is quite easy to rack a lot of points in. To me, it's the best bonus card that gives 2 pts per bird.
B-Tier
Forester (Birds that can only live in forest)- A bonus card that gives a lot of points (8 pts) for heavy investment. Problem is that investing heavily in the Forest is a risk because you want to laying eggs towards the end-game. Investing that much into the Forest deprives you of doing that. However, this weakness is offset by the fact that the Forest has a lot of Forest-only birds that let you draw extra bonus cards for a lower cost than Wetland Scientist. Plus, the minimum investment is 3 birds for 4 pts. I don't think there is a Forest-Only bird that lets you draw extra bonuses that cost more than 2 food. At least none that come to mind.
Food Web Expert (Birds that eat only invertebrate)/Historian (Birds named after a person)/Bird Counter (Birds with a tucking power)- A group of 2 pts per bird bonuses that give some easy points for minimal investment. The issue is their conditions making trying to maximize the score of these bonuses risky. Food Web Expert has a lot of low score birds. Historian has a specific condition that can conflict with your engine since many of the birds don't synergize well with each other. Bird Counter is the best one of the group, but since there are a lot of good cards in this group (American Robin, Purple Martin, Barn Swallow, House Finch, etc.), you'll probably be competing hard with your opponent to get them. Overall, they are nice bonus cards, but not great.
Rodentologist (Birds that eat rodent)/Falconer (Birds with a predator power)- I put these cards together because they are rather intertwined: most birds that eat rats also have a Predator Power. There are really good cards in this group, with high card value and high potential to get even more points through the Predator Power. However, there are a few downsides to these cards. The first being at the Vultures and Black-Billed Magpie exist. Yeah, there are only 3 of them, but their ability can effective neuter that point potential you can achieve, because giving your opponent 1 food of their choosing versus your 1 point isn't worth it. The second downside is that most of these birds have a high food cost. There are some that are cheap (Cooper's Hawk, Red-Shouldered Hawk, Barred Owl, etc.), but most cost at least 2 food, and often times 3. The final downside that one of the two Predator Powers is terrible: the one that rolls the food dice in the box that gives you a point if it matches their type. Just a really poor ability that doesn't help you most of the time.
Oologist (Birds that have at least 1 egg laid on them)- A card with a high investment, but simple condition. As mentioned, you want to lay eggs in the end-game. This card is easy to get a few extra points by doing something you should already be doing.
Passerine Specialist (Birds with wingspans 30 cm or less)- A lot of really good birds are within this group (Baltimore Oriole, Blue-Winged Warbler, Sprague's Pipit, etc.) that make getting the low score not hard to obtain. It is a high investment (4 birds for 3 pts), but this bonus card hits more often than not.
C-Tier
Wetland Scientist (Birds that can only live in wetland)- The worst habitat bonus card, but it's still decent. Getting the low score is easy. Getting the high score is difficult. The Wetland is the one habitat that you don't want to heavily invest in. 2-3 birds is all you really need. Sure, it can synergize with cards like Fishery Manager and Falconer, but without it, it's hard to justify going hard in the Wetland. A lot of the really good birds in the Wetland also have a high cost (Trumpeter Swan, Roseate Spoonbill, Wood stork, etc.). Even King Rail. a 4 pt bonus bird, costs 3 food! So, while better than other bonus cards further down the list, if I had better options, I pass on this one.
Photographer (Birds with colors in their names)- You'd think this bonus card would be really good because over 1/3 of the cards in this game meet this condition. It's not. First, it's a card with a specific condition. Second, many of those cards don't synergize well with each other. Third, it requires a large investment to reach the low score (4 birds for 3 pts). While you can get the low score often, most of the time, you are looking for birds that work well with the engine you are building, so you'll be passing on a lot of birds that meet this condition.
Large Bird Specialist (Birds with wingspans over 65 cm)- This bonus card is strictly worse than Passerine Specialist because most of the birds in this category have high costs (The good ones being 2 food minimum, usually 3) and requires a lot of investment (4 birds for only 3 pts). If you are investment in these kinds of cards, then it can work for you. I sometimes hit the minimum score, but rarely the top socre.
D-Tier
Backyard Birder (Birds worth less than 4 points)- Yes, there are good cards in this category (the almighty tuck power birds), but as I said before, you are probably competing for your opponent for those cards. Besides them, a lot of these other cards are just really bad. You have some exceptions (Spotted Towhee, Blue-Gray Gnatcatcher, Yellow-Bellied Sapsucker, Song Sparrow), but most birds in this category don't have abilities that are worth justifying a most of your capital (and more importantly, your turns) playing low cost birds just to reach the low score (5 birds for only 3 pts).
E-Tier
Breeding Manager (Birds that have at least 4 eggs laid on them)- The worst egg-laying bonus card. Yeah, there are good birds that have 4 or more slots in their nest. But only 1 pt per bird? 5 birds only give you 5 pts! This is just a really bad bonus card and will only give you a couple of extra points at best. That can make the difference, but I would only choose this bonus card over any other except for one, which is the bonus card in the F-Tier. At least this card gives you some points by doing something.
F-Tier
Visionary Leader (Bird cards in hand at end of game)- A bonus card that rewards you... for not playing cards. Or doing any other action than just drawing cards. So, while your opponents are playing cards and laying eggs for fulfill bonuses and end-of-round goals, this bonus is doing nothing for you. This bonus card is the only bonus card that doesn't even help for an end-of-round goal. Absolutely awful bonus card. The one time, and really the only time, this card could have any benefit is you have a combo of Ruddy Duck, Pied-Billed Grebe and Common Yellowthroat to draw more cards because you had an awful starting hand. Or you somehow plan to play your strategy strictly through the Wetland (Not the greatest of strategies). Even still, I toss this bonus card into the the discard deck every time.